| Testing Mean with known Variance | |
| sample size | 27 |
| population variance | 0.012 |
| sample mean | 15.48 |
| null hypothesis about mean | 15 |
| type I error | 0.05 |
| critical value (one-tailed) | 15.0346765591917 |
| confidence interval (two-tailed) (sample mean) | [ 15.4386803311797 , 15.5213196688203 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |