Sentences were chosen at random from Michael Medved's book The American Miracle: Divine Providence in the Rise of the Republic. The number of words in the sentences were counted. This is the result.

7

11

4

14

12

23

10

8

21

13

18

17

15

4

10

22

18

13

17

15

17

8

10

21

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.