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Exercises
- Practice: Make a frequency table and histogram for the following data. Then write a short description of the shape of the distribution in words.
- 11, 8, 9, 12, 9, 10, 12, 13, 11, 13, 12, 6, 10, 17, 13, 11, 12, 12, 14, 14
- Practice: For the data in Exercise 1, compute the mean, median, mode, standard deviation, and range.
- Practice: Using the data in Exercises 1 and 2, find
- the percentile ranks for scores of 9 and 14
- the z scores for scores of 8 and 12.
- Practice: The following data represent scores on the Rosenberg Self-Esteem Scale for a sample of 10 Japanese university students and 10 American university students. (Although hypothetical, these data are consistent with empirical findings [Schmitt & Allik, 2005].) Compute the means and standard deviations of the two groups, make a bar graph, compute Cohen’s d, and describe the strength of the relationship in words.
Japan |
United States |
25 |
27 |
20 |
30 |
24 |
34 |
28 |
37 |
30 |
26 |
32 |
24 |
21 |
28 |
24 |
35 |
20 |
33 |
26 |
36 |
- Practice: The hypothetical data that follow are extraversion scores and the number of Facebook friends for 15 university students. Make a scatterplot for these data, compute Pearson’s r, and describe the relationship in words.
Extraversion |
Facebook Friends |
8 |
75 |
10 |
315 |
4 |
28 |
6 |
214 |
12 |
176 |
14 |
95 |
10 |
120 |
11 |
150 |
4 |
32 |
13 |
250 |
5 |
99 |
7 |
136 |
8 |
185 |
11 |
88 |
10 |
144 |
- Practice: In a classic study, men and women rated the importance of physical attractiveness in both a short-term mate and a long-term mate (Buss & Schmitt, 1993). The means and standard deviations are as follows. Men / Short Term: M = 5.67, SD = 2.34; Men / Long Term: M = 4.43, SD = 2.11; Women / Short Term: M = 5.67, SD = 2.48; Women / Long Term: M = 4.22, SD = 1.98. Present these results
- in writing
- in a figure
- in a table
- Discussion: What are at least two reasonable ways to deal with each of the following outliers based on the discussion in this chapter? (a) A participant estimating ordinary people’s heights estimates one woman’s height to be “84 inches” tall. (b) In a study of memory for ordinary objects, one participant scores 0 out of 15. (c) In response to a question about how many “close friends” she has, one participant writes “32.”