| Testing Mean with known Variance | |
| sample size | 277 |
| population variance | 316.8008575 |
| sample mean | 33.39711191 |
| null hypothesis about mean | 0 |
| type I error | 0.05 |
| critical value (one-tailed) | 1.75905956809851 |
| confidence interval (two-tailed) (sample mean) | [ 31.3010631530516 , 35.4931606669484 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |