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Quantitative Methods PSY302 Quiz Normal Curve Review February 3, 2017
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1. For these data the mean is 500 and the standard deviation is:
600 34% Can’t say 400 16 100
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1. For these data the mean is 500 and the standard deviation is:
600 34% Can’t say 400 16 100
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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 -.25
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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 -.25
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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%
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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%
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4. Which of the following is skewed to the right?
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4. Which of the following is skewed to the right?
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5. Which curve below has the larger standard deviation?
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5. Which curve below has the larger standard deviation?
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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
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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
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7. The WAIS IQ test has a mean of 100 and a standard deviation of 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% %
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7. The WAIS IQ test has a mean of 100 and a standard deviation of 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% %
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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
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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
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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
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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
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10. What percentage of scores lie within two standard deviations of the mean?
0% 50% 68% 95% 103%
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10. What percentage of scores lie within two standard deviations of the mean?
0% 50% 68% 95% 103%
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The End
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C B D A E
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