For Exercises 3–8, use the data provided to construct a 95% confidence interval for the mean value of for the given value of . The regression equation is provided; assume the regression assumptions are met.
7.
| 10 | 100 |
| 20 | 95 |
| 30 | 85 |
| 40 | 85 |
| 50 | 80 |
13.2.7
Lower bound: 92.636 (Minitab: 92.6351); Upper bound: 105.364 (Minitab: 105.365)