| Testing Mean with known Variance | |
| sample size | 0.13 |
| population variance | 20 |
| sample mean | 21 |
| null hypothesis about mean | 0.05 |
| type I error | 0.05 |
| critical value (one-tailed) | 20.4518983057023 |
| confidence interval (two-tailed) (sample mean) | [ -3.31036126268331 , 45.3103612626833 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Do not reject the null hypothesis | |