| Testing Mean with known Variance | |
| sample size | 162 |
| population variance | 13 |
| sample mean | 20.285 |
| null hypothesis about mean | 20 |
| type I error | 0.35 |
| Z-value | 1.00607577325888 |
| p-value (one-tailed) | 0.157189560823698 |
| p-value (two-tailed) | 0.314379121647395 |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |