| 4.5 | 22 | 7 | 14.5 | 9 | 9 | 3.5 | 8 | 11 | 7.5 | 18 | 20 |
| 7.5 | 9 | 10.5 | 15 | 19 | 2.5 | 5 | 9 | 8.5 | 14 | 20 | 8 |
Compute a 95 percent confidence interval. What does this tell us?
Mean = 10.92
Standard Deviation = 5.598265777
Standard Error = 1.167319108
t = 2.069
Confidence Interval at 95 percent: 8.50 < population mean < 13.33
We are 95 percent sure that the actual population mean for the number of hours introductory psychology students studied for the last exam was somewhere between 8.5 hours and 13.33 hours. There is a 5 percent chance that the population mean does not lie within that interval.