For Exercises 7–10, assume that the samples were drawn independently and confirm that the other requirements for ANOVA are met by doing the following:
- Use technology to construct a probability plot for each group. Check for normality.
- Check for equal variances.
Question 12.7
7.
| A | B | C |
|---|---|---|
| 5 | 10 | 15 |
| 10 | 15 | 20 |
| 15 | 20 | 25 |
12.1.7
(a)
All three graphs show acceptable normality.
(b)
All three standard deviations are equal to 5, so all of them are less than . Therefore, the equal variance requirement is satisfied.