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Quantitative Methods PSY302 Quiz Normal Curve Review

Understand the normal distribution, z-scores, standard deviation, and mean in your quantitative psychology class quiz.

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Quantitative Methods PSY302 Quiz Normal Curve Review

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  1. Quantitative Methods PSY302Quiz Normal Curve Review

  2. 400 16 100 600 34% Can’t say 1. For these data the mean is 500 and the standard deviation is:

  3. 400 16 100 600 34% Can’t say 1. For these data the mean is 500 and the standard deviation is:

  4. 2. In 2002 the scores of men on the math SAT had a mean of 534 and standard deviation of 116. Bob scored 750. What is the z-score for 750? • -1.25 • 1.86 • 2.27 • 0 • -.25

  5. 2. In 2002 the scores of men on the math SAT had a mean of 534 and standard deviation of 116. Bob scored 750. What is the z-score for 750? • -1.25 • 1.86 • 2.27 • 0 • -.25

  6. 3. Attendance at a university’s basketball games follows a normal distribution with mean  = 8,000 and standard deviation  = 1,000. Estimate the percentage of games that have between 7,000 to 9,000 people in attendance. • 68% • 95% • 99.7%

  7. 3. Attendance at a university’s basketball games follows a normal distribution with mean  = 8,000 and standard deviation  = 1,000. Estimate the percentage of games that have between 7,000 to 9,000 people in attendance. • 68% • 95% • 99.7%

  8. 4. Which of the following is skewed to the right?

  9. 4. Which of the following is skewed to the right?

  10. 5. Which curve below has the larger standard deviation? a b

  11. 5. Which curve below has the larger standard deviation? a b

  12. 6. When a distribution is skewed it: • is not useful • departs from symmetry • has a mean equal to the median • is based on measurement data • is normal

  13. 6. When a distribution is skewed it: • is not useful • departs from symmetry • has a mean equal to the median • is based on measurement data • is normal

  14. 7. The WAIS IQ test has a mean of 100 and a standard deviation of 15. What percent of people score below 100 on this IQ test? • 1. 100% • 2. 75% • 3. 50% • 4. 25% • 5. 99.7%

  15. 7. The WAIS IQ test has a mean of 100 and a standard deviation of 15. What percent of people score below 100 on this IQ test? • 1. 100% • 2. 75% • 3. 50% • 4. 25% • 5. 99.7%

  16. 8. To describe a normal distribution you need the ____ and the standard deviation. • 1. hypotenuse • 2. skewness • 3. standard score • 4. mean • 5. Z score

  17. 8. To describe a normal distribution you need the ____ and the standard deviation. • 1. hypotenuse • 2. skewness • 3. standard score • 4. mean • 5. Z score

  18. 9. The mean score on the WAIS IQ scale is 100 with a standard deviation of 15. Someone who got a score of 90 would have a z-score of: • 1.96 • .75 • .68 • -1.2 • -.67

  19. 9. The mean score on the WAIS IQ scale is 100 with a standard deviation of 15. Someone who got a score of 90 would have a z-score of: • 1.96 • .75 • .68 • -1.2 • -.67

  20. 10. What percentage of scores lie within two standard deviations of the mean? • 0% • 50% • 68% • 95% • 103%

  21. 10. What percentage of scores lie within two standard deviations of the mean? • 0% • 50% • 68% • 95% • 103%

  22. Bonus Question: What percent of scores lie below a Z-score of +1? • 40% • 50% • 84% • 95% • 100%

  23. Bonus Question: What percent of scores lie below a Z-score of +1? • 40% • 50% • 84% • 95% • 100%

  24. The End

  25. C • B • D • A • E • C • C • E • D • E

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