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.

12

12

12

4

22

22

19

22

3

4

13

11

21

21

9

14

7

23

10

7

17

13

7

11

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.