PSYC 3002 Week 2 Quiz

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1. The following is a list of temperatures for the month of January: 9, 8, 8, 7, 4, 4, 3. If the temperature of 9 degrees is changed to 45, what will happen to the mean?

2. Suppose you have a set of normally distributed data where the mean is 120 and the standard deviation is 15. What score is located at -2 standard deviations?

3. ______________ distributions contain more lower scores than higher scores.

4. The advantage of the range is that

5. The main advantage of the median is that

6. What is the shape of the following distribution?

7. Which of the following sets of scores has the largest amount of variability?

8. Descriptive statistics tell us why relationships are observed in a study.

9. Why can’t a researcher just average the deviations of all of the scores from the mean as a measure of variability?

10. A program evaluator for a large school district wants to know how much intelligence varies among students in the elementary schools. She selects one classroom at each grade level in each elementary school and administers an intelligence test to the children in those classrooms. In order to find out which school has children with the most consistent intelligence levels, which of the following should she calculate for each school?

11. Which of the following is not viewed as a measure of variability?

12. If the variance of a data set is 144, what is the standard deviation?

13. If the standard deviation of a data set is 4, what is the variance?

14. What is the mean for the following set of scores: 19, 1, 1, 2, 2?

15. The median is the appropriate measure of central tendency when

16. In a normal distribution, approximately what percentage of scores is between - 1 standard deviation and + 1 standard deviation?

17. If you see the notation ??2, you should

18. With respect to a graph of a frequency distribution, a positive deviation score

19. The distinguishing characteristic of a bimodal distribution is

20. A bimodal distribution will have ___________ mode(s).