The football coach randomly chosen ten players and timed how long each player took to carry out the certain drill. The times (in minutes) were:
| players |
minutes |
| 1 |
6 |
| 2 |
15 |
| 3 |
5 |
| 4 |
11 |
| 5 |
11 |
| 6 |
5 |
| 7 |
7 |
| 8 |
9 |
| 9 |
15 |
| 10 |
11 |
Suppose that the population has the normal distribution. Find out a 95 percent confidence interval for population standard deviation sigma.
1. (2.700, 19.023)
2. (2.579,6.845)
3. 3.749
4. (2.064, 7.213)
5. None of above (do allow for slight rounding errors or table differences in selecting your solution)