| Testing Mean with known Variance | |
| sample size | 9 |
| population variance | 7 |
| sample mean | 5 |
| null hypothesis about mean | 0 |
| type I error | 0.05 |
| critical value (one-tailed) | 1.45062454667207 |
| confidence interval (two-tailed) (sample mean) | [ 3.27147423942126 , 6.72852576057874 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |