The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in addition to attending classes. At one university, it is believed that the average hours students work per week exceeds 20. To test this at a significance level of 0.05, a random sample of n = 20 students was selected and the following values were observed:
| 26 |
15 |
10 |
40 |
| 10 |
20 |
30 |
36 |
| 40 |
0 |
5 |
10 |
| 20 |
32 |
16 |
12 |
| 40 |
36 |
10 |
0 |
Based on these sample data, the critical value expressed in hours:
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