Sentences were chosen at random from J. R. R. Tolkien's book The Lord of the Rings. The number of words in the sentences were counted. This is the result.

20

6

16

3

22

9

21

12

8

18

21

21

15

12

15

23

17

12

18

22

21

6

12

14

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.