Quantitative Methods PSY302 Quiz Chapter Three Review

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Presentation transcript:

Quantitative Methods PSY302 Quiz Chapter Three Review

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

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

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

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

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%

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%

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

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

5. Which curve below has the larger standard deviation?

5. Which curve below has the larger standard deviation?

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

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

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% 5. 99.7%

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% 5. 99.7%

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

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

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

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

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

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

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