Quantitative Methods PSY302 Quiz Normal Curve Review February 7, 2018
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. The _______ of an event in the population equals the probability of the event. relative frequency Standard error of the mean Variance Importance or relevance All of the above
3. The _______ of an event in the population equals the probability of the event. relative frequency Standard error of the mean Variance Importance or relevance All of the above
4. Which of the following is positively skewed?
4. Which of the following is positively skewed?
5. Which curve below has the larger standard deviation?
5. Which curve below has the larger standard deviation?
6. The values that the statistic can take and the relative frequency of each is called: The sum of squares Implicit association A sampling distribution Chi square All of the above
6. The values that the statistic can take and the relative frequency of each is called: The sum of squares Implicit association A sampling distribution Chi square All of the above
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%
Bonus Question: What percent of scores lie below a Z-score of +1? 40% 50% 84% 95% 100%
Bonus Question: What percent of scores lie below a Z-score of +1? 40% 50% 84% 95% 100%
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