Exercises

Investigate the validity of 95% confidence intervals on p for each of the following combinations:

p

N

0.5

8

0.5

25

0.8

8

0.8

25

0.9

10

0.9

25

0.9

50


Under which of the following two situations do you think 95% confidence intervals contain p very close to 95% of the time?

1. p = 0.5, N=9
2. p = 0.5, N = 10

Try it out and see if your intuition is correct.