| Testing Mean with known Variance | |
| sample size | 98 |
| population variance | 0.35 |
| sample mean | 20.2857142857143 |
| null hypothesis about mean | 13 |
| type I error | 0.05 |
| critical value (one-tailed) | 13.098298805655 |
| confidence interval (two-tailed) (sample mean) | [ 20.1685840343349 , 20.4028445370937 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |