Sentences were chosen at random from Dennis Prager's book Still the Best Hope: Why the World Needs American Values to Triumph. The number of words in the sentences were counted. This is the result.

16

12

18

14

10

11

13

15

18

9

12

15

17

4

20

16

9

22

23

23

11

18

12

17

Problem:

Use the data above to: a) determine the mean and sample standard deviation, b) calculate a 95% margin of error, c) determine the respective confidence interval.