| Testing Mean with known Variance | |
| sample size | 162 |
| population variance | 13 |
| sample mean | 21.0806451612903 |
| null hypothesis about mean | 20 |
| type I error | 0.35 |
| Z-value | 3.81477514478459 |
| p-value (one-tailed) | 6.81534950196516e-05 |
| p-value (two-tailed) | 0.000136306990039303 |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |