Sentences were chosen at random from Douglas Adams's book Mostly Harmless. The number of words in the sentences were counted. This is the result.

15

5

15

6

9

10

3

20

18

11

3

18

23

19

6

6

7

11

8

21

12

15

14

23

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.