Chapter 9.1, Problem 25BB

a.

To determine

Construct the 95% confidence interval estimate of the difference $p_1-p_2$.

Check whether the result suggest about equality of $p_1$ and $p_2$.

b.

To determine

Find the 95% confidence interval estimate for first sample $p_1$.

Construct the 95% confidence interval estimate for second sample $p_2$.

Compare the two confidence interval and conclude about the equality of $p_1$ and $p_2$.

c.

To determine

Test whether there is sufficient evidence to rejection the claim that the two population proportions are equal or not.

d.

To determine

Check the conclusion about the equality of $p_1$ and $p_2$ based on the preceding results.

Identify the least effective method in testing for the equality of $p_1$ and $p_2$ based on the preceding results.