| Testing Mean with known Variance | |
| sample size | 9 |
| population variance | 2 |
| sample mean | 4 |
| null hypothesis about mean | 0 |
| type I error | 0.05 |
| critical value (one-tailed) | 0.775391435784449 |
| confidence interval (two-tailed) (sample mean) | [ 3.07606411710021 , 4.92393588289979 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |