| Testing Mean with known Variance | |
| sample size | 20 |
| population variance | 0.13 |
| sample mean | 21.159 |
| null hypothesis about mean | 20 |
| type I error | 0.35 |
| critical value (one-tailed) | 20.0310655291587 |
| confidence interval (two-tailed) (sample mean) | [ 21.0836510024657 , 21.2343489975343 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |