(Test Bank) Statistics for Psychology

Aron,Coups,Cooley, 7

Math & Statistics

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7th Edition

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Author(s): Aron, Coups, Cooley

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Test Bank for Statistics for Psychology, 7e Arthur Aron, Elaine Aron, Elliot Coups, Erin Cooley (All Chapters Download link at the end of this file) Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 1 Indicate the answer choice that best completes the statement or answers the question. 1. A psychologist who constructs a frequency table to summarize data collected on the amount of stress people have experienced in the last 2½ weeks is using a(n) a. measure of central tendency. b. descriptive statistical method. c. intuitive statistical method. d. inferential statistical method. 2. Students who have read the first chapter of the textbook and theorize that performance on statistics exams will be related to the number of hours spent studying statistics know that to test their theory, they will need to use a. common sense. b. reasoning by analogy. c. inferential statistics. d. intuition. 3. The two branches of statistical methods are a. theoretical and inferential. b. intuitive and theoretical. c. descriptive and intuitive. d. descriptive and inferential. 4. If a researcher studying positive psychology in people develops a questionnaire to measure well-being, the researcher will use the questionnaire scores as a a. functional concept. b. variable. c. descriptive statistic. d. qualitative value. 5. Several psychotherapy clients are rated for their degree of depression. If a particular client's depression is rated 8 on a 20-point scale, 8 represents that client's a. frequency. b. variable. c. score. d. mean. 6. If an intelligence test includes 12 items so that a person can answer any number of items between 0 and 12 correctly, each of these numbers between 0 and 12 is called a a. value. b. variable. c. rating. d. mean. 7. If a difference between scores of 3 and 4 is the same as a difference between scores of 15 and 16, the variable being measured is Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 2 a. equal -interval. b. differential. c. non-differential. d. rank-order. 8. The number of problems correct on a test is an example of what kind of variable? a. continuous b. discrete c. log-linear d. quadratic 9. The length of time a person talks in a group discussion is an example of what kind of variable? a. continuous b. categorical c. transformed d. extraneous 10. If the degree of difference between two scores has no meaning beyond the fact that one is higher than the other, the level of measurement is a. nominal. b. extraneous. c. rank-order. d. equal -interval. 11. Another label for "rank -order" is a. categorical. b. ratio. c. ordinal. d. continuous. 12. Which of the following student characteristics is an example of a nominal variable? a. grade point average (3.2, 2.5, etc.) b. number of friends (0, 1, etc.) c. birth position in the family (first, second, etc.) d. college major (Psychology, Sociology, Business, etc.) 13. Which of the following student characteristics is an example of a rank-order variable? a. grade point average (3.2, 2.5, etc.) b. number of friends (0, 1, etc.) c. birth position in the family (first, second, etc.) d. college major (Psychology, Sociology, Business, etc.) 14. Which of the following student characteristics is an example of a discrete equal -interval variable? a. grade point average (3.2, 2.5, etc.) Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 3 b. number of friends (0, 1, etc.) c. birth position in the family (first, second, etc.) d. college major (Psychology, Sociology, Business, etc.) 15. Which of the following student characteristics is an example of a continuous equal -interval variable? a. grade point average (3.2, 2.5, etc.) b. number of friends (0, 1, etc.) c. birth position in the family (first, second, etc.) d. college major (Psychology, Sociology, Business, etc.) 16. The value of putting numbers into a frequency table is that a. it makes the pattern of numbers clear at a glance. b. it is easier to draw inferences from tables. c. such tables are required by many journals. d. such tables are always formatted in the same way. 17. A frequency table lists the a. times per second variations occur in various wave bands. b. number of scores at each value. c. intensity of a variable over all the participants studied. d. average value of each variable. 18. Consider the scores 2, 6, 7, 1, 7, 8, 5, and 4. According to the text, which of the following would be the correct second line of a frequency table? a. 2 1 12.5% b. 7 2 25% c. 6 1 6% d. 1 1 12.5% 19. Consider the scores 1, 1, 1, 1, 2, 2, 6, 7, 9, 9. Which of the following would be the correct percentage for a score of 9 in a frequency table? a. 10% b. 20% c. 40% d. 90% 20. A psychologist tries to summarize reaction time data (measured in seconds) for a variable in a frequency table but finds that there are so many different values that the table is too cumbersome to be useful. The next step would be to a. make a histogram. b. convert reaction time into a rank-order variable. c. group the reaction times into intervals. d. use a discrete continuous variable instead. 21. A student seeing 5.0-9.9 in a journal article table knows this is a(n) a. interval. Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 4 b. cumulative percent. c. value. d. ordinal rank. 22. All students in a statistics class are in one of four majors: Psychology, Sociology, Communication, or Business. If the numbers of students in each major are presented in a frequency table, which of the following table columns would NOT appear? a. Major b. Frequency c. Percentage d. Cumulative percentage 23. A histogram looks most like a a. city skyline. b. large wave. c. silhouette of mountains. d. pattern of iron filings. 24. In a histogram, the vertical dimension shows the a. possible values the variable can have. b. intensity of the variable. c. mean score. d. frequency. 25. In a histogram, the horizontal dimension shows the a. possible values the variable can have. b. intensity of the variable. c. mean score. d. frequency. 26. A difference between a histogram and a bar graph is that the bar graph a. is based on percentages. b. has spaces between the bars. c. is for numeric values. d. begins with a frequency of zero. 27. Psychologists use frequency tables and histograms to show the a. relationship between two variables. b. reasoning behind experiments. c. hypotheses they plan to test. d. way numbers they collect are distributed. 28. The best way to display a nominal variable is to use a a. histogram. b. grouped frequency table. Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 5 c. bar graph. d. line graph. 29. A frequency polygon looks most like a a. city skyline. b. large wave. c. silhouette of mountains. d. pattern of iron filings. 30. The distribution of the scores in most psychological research studies are approximately a. unimodal. b. bimodal. c. multimodal. d. rectangular. 31. If a psychologist rating empathic responses to strangers' distress on a scale of 1 to 20 finds that most participants have ratings of either 8 or 16, the distribution of ratings is a. bimodal. b. unimodal. c. rectangular. d. normal. 32. If a psychologist rating empathic responses to strangers' distress on a scale of 1 to 20 finds that most participants have ratings of 8, 12, or 16, the distribution of ratings is a. rectangular. b. unimodal. c. multimodal. d. normal. 33. A distribution of scores showing a ceiling effect will be a. symmetrical. b. positively skewed. c. negatively skewed. d. rectangular. 34. A distribution of scores showing a floor effect would be a. symmetrical. b. positively skewed. c. negatively skewed. d. rectangular. 35. A normal curve is a. bimodal. b. symmetrical. c. kurtotic. Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 6 d. skewed. 36. Scores that form a distribution that is skewed to the right are likely demonstrating which kind of effect? a. ceiling b. rectangular c. floor d. kurtotic 37. Scores that form a distribution that is skewed to the left are likely demonstrating what kind of effect? a. ceiling b. rectangular c. floor d. kurtotic 38. When a distribution is heavy -tailed, it is a. flatter than a normal curve. b. skewed to the right. c. skewed to the left. d. more peaked than a normal curve. 39. When a distribution is light-tailed, it is a. flatter than a normal curve. b. skewed to the right. c. skewed to the left. d. more peaked than a normal curve. 40. A frequency table is likely to be included in a research article a. when there are only two values for a variable of interest. b. if there are a very small number of scores. c. when complex statistical results are reported. d. to show participant demographic characteristics. 41. If psychologists want to summarize a group of numbers collected in a research study and make them more understandable, they will use __________. 42. If psychologists want to draw statistical conclusions that go beyond the numbers collected in a research study, they will use __________. 43. If a student answers 20 of 25 multiple -choice items on a statistics test correctly, 20 is the student's __________. 44. If a study measures the relationship between happiness and empathy, happiness and empathy are __________. 45. If the difference between scores of 3 and 4 has the same meaning as the difference between scores of 25 and 26 on a particular measure, the measure is said to be __________. Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 7 46. A variable that has specific values and cannot have values between those specific values is a(n) __________. 47. A variable that has an infinite number of values is __________. 48. Another name for ordinal measurement is __________. 49. Religion, college major, and language spoken at home are all examples of __________. 50. Nominal variables, but not rank-order or equal -interval variables, are examples of __________. 51. Olympi c medals (Gold, Silver, Bronze) are an example of a(n) __________. 52. A listing that shows how many times each value of a variable occurs among a particular group of scores is called a(n) __________. 53. The type of table created when a psychologist lists the number of employees at each level of earnings from $20,000 to $29,999 going up to $80,000 to $99,999 is a(n) __________. 54. A way to simplify a frequency table when there are a large number of possible values is to group the score s into __________. 55. A graph of frequencies in which the bars are adjacent to each other is a(n) __________. 56. In a histogram, the vertical axis displays __________. 57. The best way to graphically represent data such as college major or language spoken at home is to use a(n) __________. 58. If one of the bars of a histogram is higher than all the others, the distribution is __________. 59. If each half of a distribution is a mirror image of the other, the distribution is __________. 60. A distribution in which the scores pile up at one end is said to be __________. 61. A distribution that is flatter or more peaked than a normal curve is said to be __________. 62. Since no environment can be quieter than no noise at all, a survey of noise in various study environments found that noise scores tended to pile up at the low end, reflecting a(n) __________. 63. A psychologist would include difficult questions on an intelligence test to reduce the number of perfect scores in order to avoid a(n) __________. 64. A distribution that is flatter than normal is also referred to as __________. 65. A distribution that is more peaked than normal is also referred to as __________. Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 8 Answer Key 1. b 2. c 3. d 4. b 5. c 6. a 7. a 8. b 9. a 10. c 11. c 12. d 13. c 14. b 15. a 16. a 17. b 18. a 19. b 20. c 21. a 22. d 23. a 24. d 25. a Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 9 26. b 27. d 28. c 29. c 30. a 31. a 32. c 33. c 34. b 35. b 36. c 37. a 38. d 39. a 40. d 41. descriptive statistics 42. inferential statistics 43. score 44. variables 45. equal -interval 46. discrete variable 47. continuous 48. rank-order measurement 49. nominal variables 50. categorical variables 51. rank-order measurement Name: Class: Date: Chapter 01: Displaying the Order in a Group of Numbers Using Tables and Graphs Powered by Cognero Page 10 52. frequency table 53. grouped frequency table 54. intervals 55. histogram 56. frequencies 57. bar graph 58. unimodal 59. symmetrical 60. skewed 61. kurtotic 62. floor effect 63. ceiling effect 64. light-tailed 65. heavy -tailed Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 1 Indicate the answer choice that best completes the statement or answers the question. 1. A typical or most representative value of a group of scores is a measure of a. standard deviation. b. correlation. c. frequencies. d. central tendency. 2. The ordinary average of a group of numbers is the a. median. b. mean. c. standard deviation. d. mode. 3. Based on the scores 1, 9, 3, 6, 1, 2, 6, 2, 2, 8, a score of 4 is the a. mode. b. median. c. mean. d. standard deviation. 4. What is the median for the following scores: 1, 9, 3, 6, 1, 2, 6, 2, 2, 8? a. 1.5 b. 2 c. 2.5 d. 4 5. The correct formula for the mean is a. b. c. d. 6. The correct description of the mean is the a. sum of the scores that is most frequent in a distribution. b. middle score if all the scores are ordered from lowest to highest. c. average of the squared deviations from the median. d. sum of the scores divided by the number of scores. 7. In statistical formulas, N stands for the a. number of different values for a variable. b. number of scores. Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 2 c. normal curve. d. standard deviation. 8. The ΣX for the scores 1, 1, 8, 10 is a. 4 b. 4.5 c. 5 d. 20 9. The most common single value in a group of scores is the a. mode. b. mean. c. median. d. average. 10. Based on the scores 1, 2, 3, 4, 5, 6, 6, 8, 8, 8, 9, 10, a score of 8 is the a. mean. b. median. c. mode. d. standard deviation. 11. Based on the scores 1, 2, 3, 4, 5, 6, 6, 8, 8, 8, 9, 10, a score of 6 is the a. mean. b. median. c. mode. d. standard deviation. 12. The best measure of central tendency to describe a nominal variable is the a. mean. b. median. c. mode. d. standard deviation. 13. The mean and the mode for a statistics test will be the same if the distribution is a. skewed. b. normal. c. bimodal. d. multimodal. 14. The middle value in a set of scores arranged from lowest to highest is the a. mean. b. mode. c. average. d. median. Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 3 15. To calculate the median of a distribution of scores, the first step is to a. find the most frequently occurring score. b. sum the scores. c. order the scores from lowest to highest. d. calculate N. 16. The median of the scores 0, 1, 1, 2, 3, 5, 6, 6, 6, 8, 10 is a. 1 b. 4.4 c. 5 d. 6 17. The mode of the scores 0, 1, 1, 2, 3, 5, 6, 6, 6, 8, 10 is a. 1 b. 4.4 c. 5 d. 6 18. What is the median of the scores 0, 2, 2, 3, 5, 6, 8? a. 0 b. 2 c. 2.5 d. 3 19. Which statement is true for the scores of 1, 2, 3, 4, 5, 5, 7, 8, 9, 10? a. The mode is greater than the median. b. The median is greater than the mode. c. The mean is greater than the median. d. The mean is less than the mode. 20. Which statement is true for the scores of 1, 2, 3, 4, 5, 5, 7, 8, 9, 10? a. The mean is less than the median. b. The median is less than the mode. c. The median and mode are both greater than the mean. d. The median and mode are the same. 21. A cognitive psychologist finds that a group of one-year-old children can name 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 35 things. For this data set, the most useful measure of central tendency will be the a. mean. b. median. c. mode. d. range. 22. A distribution is negatively skewed. The measures of central tendency are most likely to be in which of the following orders? Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 4 a. mean = 30, median = 50, mode = 70 b. mean = 30, median = 70, mode = 50 c. mean = 50, median = 50, mode = 50 d. mean = 70, median = 50, mode = 30 23. When a distribution is skewed to the right, the a. mode is greater than the median. b. mean and the median are the same. c. mean is greater than the median. d. mean and the mode are equal. 24. The median is greater than the mean in a distribution that is a. symmetrical. b. skewed to the right. c. normal. d. skewed to the left. 25. In a symmetrical distribution with a mean of 15, the median would be a. equal to 15. b. less than 15. c. greater than 15. d. either B or C. 26. One of the most important characteristics of the mean is that a. it is affected by any changes to scores in a distribution. b. it is the only measure of central tendency that can be used for nominal variables. c. half of a distribution's scores always fall above it, and half below it. d. it can never be the same as the mode. 27. If your data show outliers on the upper end of the distribution, the most representative value for the group of scores is probably the a. mode. b. mean. c. standard deviation. d. median. 28. In a sample of three people, the first person has a score 5 points above the mean, and the second person has a score 3 points above the mean. Which of the following provides the most accurate description of the score for the third person? a. It is below the mean. b. It is below the mean by 4 points. c. It is below the mean by 8 points. d. It cannot be described based on the information provided. 29. In a sample of four people, Person A has a score 5 points below the mean, Person B has a score 3 points above the mean, and Person C has a score 2 points above the mean. Which of the following provides the most accurate description Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 5 of the score for Person D? a. It is equal to 0. b. It is equal to the mean. c. It is below the mean. d. It is above the mean. 30. The variance is the same as the a. average of the squared deviations. b. sum of the squared deviations. c. average of the absolute deviations. d. sum of the absolute deviations. 31. The symbol for the variance used in this chapter is a. SD2 b. SD c. d. Σ(X-M)2 32. The formula for the standard deviation used in this chapter is a. SD2 b. SD c. d. Σ(X-M)2 33. If the variance of 20 scores is 16, then the standard deviation is a. 0.8 b. 4 c. 32 d. 256 34. If the standard deviation of 10 scores is 5, the variance is a. 0.5 b. 5 c. 10 d. 25 35. The variance of the scores 2, 5, 8 is a. 9 b. 6 c. 4 d. 3 Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 6 36. The variance of the scores: 0, 1, 1, 2 is a. .25 b. .5 c. √.5 d. 1 37. The standard deviation of the scores: 2, 1, 1, 8 is a. 1.71 b. 2 c. 2.92 d. 8.5 38. SS refers to a. SD2 b. variance computed using the N-1 formula c. standard deviation d. Σ(X-M)2 39. A psychologist studying cultural diversity who conducts a few lengthy interviews with members of various cultural communities is using a. behavioral techniques. b. quantitative techniques. c. qualitative techniques. d. positivistic techniques. 40. A psychologist conducts a survey of job satisfaction among laborers and white -collar workers using a rating scale on which 1 indicates low satisfaction and 10 indicates high satisfaction. The findings are that laborers have a mean job satisfaction score of 4 and a variance of 1; white -collar workers have a mean job satisfaction score of 7 and a variance of 10. Which statement most completely describes the meaning of these numbers? a. White -collar workers are more satisfied than laborers. b. White -collar workers and laborers are about equally satisfied. c. Laborers generally are less satisfied than white -collar workers, but laborers are just as likely to be highly satisfied as white -collar workers are to be highly dissatisfied. d. Labo rers are less satisfied than white -collar workers, and most laborers are about equally dissatisfied, while there is more variation in the satisfaction of white -collar workers. 41. is the formula for the __________. 42. The mean of the scores 2, 5, 11 is __________. 43. A general name for the representative value of a group of scores is __________. 44. A score with an extremely high or low value (relative to other scores in the distribution) is a(n) __________. Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 7 45. The Greek letter that means "add up all the scores that follow" is __________. 46. N of the scores 4, 6, 7, 7, 8 is __________. 47. The value with the most scores in a distribution is the __________. 48. The median of the scores 6, 18, 4, 21, and 22 is __________. 49. If scores are ranked from lowest to highest, the median is the __________. 50. In the group of scores 2, 81, 82, 82, and 84, the outlier is __________. 51. The best measure of central tendency to use when a distribution has outliers is the __________. 52. The usual way of describing the central tendency of a nominal variable is to use the __________. Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 8 Answer Key 1. d 2. b 3. c 4. c 5. a 6. d 7. b 8. d 9. a 10. c 11. b 12. c 13. b 14. d 15. c 16. c 17. d 18. d 19. c 20. d 21. b 22. a 23. c 24. d 25. a Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 9 26. a 27. d 28. c 29. b 30. a 31. a 32. c 33. b 34. d 35. b 36. b 37. c 38. d 39. c 40. d 41. mean 42. 6 43. central tendency 44. outlier 45. S 46. 5 47. mode 48. 18 49. middle score 50. 2 51. median Name: Class: Date: Chapter 02: Central Tendency and Variability Powered by Cognero Page 10 52. mode Name: Class: Date: Chapter 03: Some Key Ingredients for Inferential Statistics: Z Scores, the Normal Curve, Sample versus Population, and Probability Powered by Cognero Page 1 Indicate the answer choice that best completes the statement or answers the question. 1. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). The measure that describes a score in terms of how much it is above or below the mean is the a. median. b. variance. c. standard deviation. d. Z score. 2. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). In a distribution of Z scores, the mean is always a. greater than 1 b. 1 c. 0 d. equal to the sample mean 3. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). The variance of a distribution of Z scores is always a. unimodal. b. equal to the sample variance. c. 0. d. 1. 4. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). Which of the following statements regarding Z scores is FALSE? a. It indicates whether the raw score is above or below average. b. It indicates whether or not a distribution is skewed. c. It indicates the percentage of cases between that score and the mean. d. It is sometimes referred to as a standard score. 5. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). A score that is below the mean of its distribution will always have a Z score that is a. negative. b. between 0 and 1. c. equal to the standard deviation. d. skewed. Name: Class: Date: Chapter 03: Some Key Ingredients for Inferential Statistics: Z Scores, the Normal Curve, Sample versus Population, and Probability Powered by Cognero Page 2 6. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). The raw score that corresponds to a Z score of 2.0 obtained from a distribution with a mean of 80 and a standard deviation of 10 is a. 82 b. 90 c. 100 d. 170 7. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). If the mean of a test is 15 and its standard deviation is 3, the Z score for a person with a raw score of 12 is a. -2 b. -1 c. 1 d. 2 8. Note : Some problems require the normal curve table, which can be copied from the textbook's Appendix (Table A-1). The normal curve is most likely to be described as a. bimodal and roughly symmetrical. b. unimodal, roughly symmetrical, and bell-shaped. c. skewed to the right. d. a roughly symmetrical U-shape. 9. The question below are based on the following scenario. Maria wants to pursue a graduate degree at New University but is unsure whether to specialize in law or medicine. To help her decide, she takes the MCAT and LSAT exams. LSAT: Maria's score = 170; Students at New University: M = 150, SD = 10 MCAT: Maria's score = 482; Students at New University: M = 500, SD = 9 Maria's Z scores were: a. LSAT, Z = 2.00; MCAT Z = 2.00 b. LSAT, Z = 2.00; MCAT Z = -2.00 c. LSAT, Z = -2.00; MCAT Z = 2.00 d. LSAT, Z = -2.00; MCAT Z = -2.00 10. The question below are based on the following scenario. Maria wants to pursue a graduate degree at New University but is unsure whether to specialize in law or medicine. To help her decide, she takes the MCAT and LSAT exams. LSAT: Maria's score = 170; Students at New University: M = 150, SD = 10 Name: Class: Date: Chapter 03: Some Key Ingredients for Inferential Statistics: Z Scores, the Normal Curve, Sample versus Population, and Probability Powered by Cognero Page 3 MCAT: Maria's score = 482; Students at New University: M = 500, SD = 9 In relation to the other people at New University, on which test did Maria get the better score? a. the LSAT b. the MCAT c. the scores were equal d. it is impossible to say without more information 11. The question below are based on the following scenario. Maria wants to pursue a graduate degree at New University but is unsure whether to specialize in law or medicine. To help her decide, she takes the MCAT and LSAT exams. LSAT: Maria's score = 170; Students at New University: M = 150, SD = 10 MCAT: Maria's score = 482; Students at New University: M = 500, SD = 9 Using the percentage approximations for the normal curve, the percentage of people having a lower score than Maria on the MCAT would be: a. 2% b. 14% c. 48% d. 98% 12. The question below are based on the following scenario. Maria wants to pursue a graduate degree at New University but is unsure whether to specialize in law or medicine. To help her decide, she takes the MCAT and LSAT exams. LSAT: Maria's score = 170; Students at New University: M = 150, SD = 10 MCAT: Maria's score = 482; Students at New University: M = 500, SD = 9 Using the percentage approximations for the normal curve, the percentage of people having a lower score than Maria on the LSAT would be: a. 2% b. 14% c. 48% d. 98% 13. If the mean score on a creativity test is 20, the standard deviation is 5, and the distribution is normal, the percentage of people who would obtain scores between 15 and 25 is a. 34% b. 14% + 34% = 48% c. 50% d. 34% + 34% = 68% 14. If the mean score on a stress scale is 5, the standard deviation is 2, and the distribution is normal, what would be the mean value when converted to a Z distribution? a. 0 Name: Class: Date: Chapter 03: Some Key Ingredients for Inferential Statistics: Z Scores, the Normal Curve, Sample versus Population, and Probability Powered by Cognero Page 4 b. 2 c. 5 d. not enough information to make a determination 15. If the mean score on a stress scale is 5, the standard deviation is 2, and the distribution is normal, the percentage of people who would obtain scores between 5 and 9 is a. 34% b. 14% + 34% = 48% c. 50% d. 34% + 34% = 68% 16. If the mean score on a stress scale is 5, the standard deviation is 2, and the distribution is normal, the percentage of people who would obtain a score of at least 7 is a. 34% b. 50% c. 64% d. 84% 17. Using the percentage approximations for the normal curve, the percentage of scores between the mean and one standard deviation below the mean is a. 14% b. 50% c. 34% d. 14% + 34% = 48% 18. Using a normal curve table, if a person received a test score that is in the top 33% of all test scores, the person's Z score must be at least a. 2.00 b. 1.33 c. 0.95 d. 0.44 19. Using a normal curve table, the percentage of scores between a Z score of 1.10 and a Z score of 1.61 is a. 0.51% b. 3.04% c. 8.20% d. 86.43% 20. Using a normal curve table, if a person has a score in the bottom 23% of all scores in a distribution, the highest Z score this person can have is approximately a. -0.96 b. -0.74 c. -0.20 d. 0.96