| Testing Mean with known Variance | |
| sample size | 20 |
| population variance | 13 |
| sample mean | 21.159 |
| null hypothesis about mean | 20 |
| type I error | 0.35 |
| critical value (one-tailed) | 20.3106552915872 |
| confidence interval (two-tailed) (sample mean) | [ 20.4055100246566 , 21.9124899753434 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |