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

6

21

22

19

21

15

6

16

15

18

7

4

5

9

8

6

6

21

12

17

15

19

15

6

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.