Sentences were chosen at random from Michio Kaku's book The Future of the Mind. The number of words in the sentences were counted. This is the result.

11

3

4

16

4

14

9

19

12

17

6

7

11

12

15

15

7

22

6

6

19

23

4

5

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.