For Exercises 5–10, the observed frequencies are provided in a contingency table of two categorical variables. Find the expected frequencies, on the assumption that the variables are independent.
5.
| A1 | A2 | |
|---|---|---|
| B1 | 10 | 20 |
| B2 | 12 | 18 |
11.2.5
| A1 | A2 | Total | |
|---|---|---|---|
| B1 | 11 | 19 | 30 |
| B2 | 11 | 19 | 30 |
| Total | 22 | 38 | 60 |