12 Refer to Example 7.3.

a) Find point estimates of the proportions of Americans who disagree with the statement about women's roles in 1982 and in 1994.

b) Find a 95% confidence interval for the change in the disagree proportion, and compare it to the interval found following Example 7.3 for the change in the agree proportion. Ex- plain the correspondence

c) Conduct a test for equality of the disagree proportions in 1982 and 1994 Compare to the result of the test for the agree proportions, and explain the correspondence.