For Exercises 7–10, calculate , the sum of the ranks for the first sample, , , and, if appropriate, and . Also find the sample sizes and the total sample size. The data represent independent random samples.
7.
| Sample 1 | 2 | 3 | 4 | 5 | 5 |
| Sample 2 | 6 | 9 | 10 | 7 | 9 |
| Sample 3 | 5 | 3 | 3 | 1 | 2 |