Here is data on the age (in months) that 20 children said their first words of English.
| 15 |
26 |
10 |
9 |
15 |
20 |
18 |
11 |
8 |
20 |
| 7 |
9 |
10 |
11 |
11 |
10 |
12 |
17 |
11 |
10 |
Treat this as an SRS. Use it to provide a 95% confidence interval of the mean age in months at which children say their first words.
Lower confidence level:
Upper confidence level: