| Testing Mean with known Variance | |
| sample size | 162 |
| population variance | 13 |
| sample mean | 20.2857142857143 |
| null hypothesis about mean | 0 |
| type I error | 0.35 |
| critical value (one-tailed) | 0.109153143177714 |
| confidence interval (two-tailed) (sample mean) | [ 20.0209648950266 , 20.550463676402 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |