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.

19

6

22

3

7

22

5

5

6

5

11

21

22

21

22

21

10

3

21

3

3

23

15

9

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.