Quantitative Methods PSY302 Quiz Normal Curve Review February 6, 2017
1. ____ means the data are not symmetrical. quantitative low variability high variability density skewed
1. ____ means the data are not symmetrical. quantitative low variability high variability density skewed
2. This symbol represents: σ the sample mean parameter the population mean statistic all of the above
2. This symbol represents: σ the sample mean parameter the population mean statistic all of the above
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. What percent of scores fall below a Z score of -.97? 28.4% 97% 87.6% 16.6% 50.1%
4. What percent of scores fall below a Z score of -.97? 28.4% 97% 87.6% 16.6% 50.1%
5. SAT mean=1020, SD=207 What percent score less than 720 5. SAT mean=1020, SD=207 What percent score less than 720? What is the Z-score? .72 -1.45 -1.0 -3.5
5. SAT mean=1020, SD=207 What percent score less than 720 5. SAT mean=1020, SD=207 What percent score less than 720? What is the Z-score? .72 -1.45 -1.0 -3.5
6. What percent of scores fall below a Z score of 1.28? .8997 89.9% 56% 28% A & B are correct
6. What percent of scores fall below a Z score of 1.28? .8997 89.9% 56% 28% A & B are correct
7. What percent of scores lie within 3 standard deviations of the mean? 68 95 99.7 Can’t say
7. What percent of scores lie within 3 standard deviations of the mean? 68 95 99.7 Can’t say
8. Calculating _____ requires measurement data. a proportion the mean the mode percent rank
8. Calculating _____ requires measurement data. a proportion the mean the mode percent rank
9. Assuming a mean of 150. 4 and a standard deviation of 8 9. Assuming a mean of 150.4 and a standard deviation of 8.44, what is the z score for a raw score of 147? -2.2 -.42 .89 1.47
9. Assuming a mean of 150. 4 and a standard deviation of 8 9. Assuming a mean of 150.4 and a standard deviation of 8.44, what is the z score for a raw score of 147? -2.2 -.42 .89 1.47
10. To describe a normal distribution you need the. (p. 64) median and range standard deviation and variance mean and standard deviation Z score and range standard score and deviation score
10. To describe a normal distribution you need the. (p. 64) median and range standard deviation and variance mean and standard deviation Z score and range standard score and deviation score
Bonus: Which group has the higher standard deviation for height? Alpha Beta Both are the same Can’t say Alpha Beta
Bonus: Which group has the higher standard deviation for height? Alpha Beta Both are the same Can’t say Alpha Beta
The End