| Testing Mean with known Variance | |
| sample size | 9 |
| population variance | 6 |
| sample mean | 4 |
| null hypothesis about mean | 0 |
| type I error | 0.05 |
| critical value (one-tailed) | 1.34301736253245 |
| confidence interval (two-tailed) (sample mean) | [ 2.39969610788156 , 5.60030389211844 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |