| Testing Mean with known Variance | |
| sample size | 40 |
| population variance | 500 |
| sample mean | 1950 |
| null hypothesis about mean | 1800 |
| type I error | 0.05 |
| critical value (one-tailed) | 1805.81543576838 |
| confidence interval (two-tailed) (sample mean) | [ 1943.07048087825 , 1956.92951912175 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |