| Testing Mean with known Variance | |
| sample size | 129 |
| population variance | 0.46 |
| sample mean | 7.75 |
| null hypothesis about mean | 7.5 |
| type I error | 0.05 |
| critical value (one-tailed) | 7.59822257547241 |
| confidence interval (two-tailed) (sample mean) | [ 7.6329605824857 , 7.8670394175143 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |