| Testing Mean with known Variance | |
| sample size | 60 |
| population variance | 40000 |
| sample mean | 2460 |
| null hypothesis about mean | 2400 |
| type I error | 0.05 |
| critical value (one-tailed) | 2442.46993802755 |
| confidence interval (two-tailed) (sample mean) | [ 2409.39394752473 , 2510.60605247527 ] |
| conclusion for one-tailed test | |
| Reject the null hypothesis. | |
| conclusion for two-tailed test | |
| Reject the null hypothesis | |