A psychologist investigates the hypothesis that birth order affects assertiveness
tutor4helpyou24. A psychologist investigates the hypothesis that birth order affects assertiveness. Her subjects are 20 young adults between 20 and 25 years of age. There are seven first-born, six second-born, and seven third born subjects. Each subject is given an assertiveness test, with the following results. High scores indicate greater assertiveness. Assume the data are so far from normally distributed that the F test can’t be used, but the data are at least of ordinal scaling. Use α = 0.01 to evaluate the data. What is your conclusion?
Condition 1 First-Born | Rank | Condition 2 Second-Born | Rank | Condition 3 Third-Born | Rank |
18 | 12 | 18 | 12 | 7 | 6 |
8 | 7 | 12 | 9 | 19 | 14 |
4 | 4 | 3 | 3 | 2 | 2 |
21 | 15 | 24 | 17 | 30 | 19 |
28 | 18 | 22 | 16 | 18 | 12 |
32 | 20 | 1 | 1 | 5 | 5 |
10 | 8 |
|
| 14 | 10 |
= 7 |
= 84 |
= 6 |
= 58 |
= 7 |
= 68 |
26. A major oil company conducts an experiment to assess whether a film designed to tell the truth about, and also promote more favorable attitudes toward, large oil companies really does result in more favorable attitudes. Twelve individuals are run in a replicated measures design. In the “Before” condition, each subject fills out a questionnaire designed to assess attitudes toward large oil companies. In the “After” condition, the subjects see the film, after which they fill out the questionnaire. The following scores were obtained. High scores indicate more favorable attitudes toward large oil companies. Analyze the data using the Wilcoxon signed ranks
Before | After | Difference | Rank of (Difference) | Signed Rank of Difference | Sum of Positive Ranks | Sum of Negative Ranks |
43 | 45 | -2 | 1 | -1 |
| 1 |
48 | 60 | -12 | 11 | -11 |
| 11 |
25 | 22 | 3 | 2 | 2 | 2 |
|
24 | 33 | -9 | 8 | -8 |
| 8 |
15 | 7 | 8 | 7 | 7 | 7 |
|
18 | 22 | -4 | 3 | -3 |
| 3 |
35 | 41 | -6 | 5 | -5 |
| 5 |
28 | 21 | 7 | 6 | 6 | 6 |
|
41 | 55 | -14 | 12 | -12 |
| 12 |
28 | 33 | -5 | 4 | -4 |
| 4 |
34 | 44 | -10 | 9 | -9 |
| 9 |
12 | 23 | -11 | 10 | -10 |
| 10 |
- 9 years ago
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