1. Let n1= 80, X1= 70, n2= 80, and X2= 50.
a. At the 0.10 level of significance, is there evidence of a significant difference between the two population proportions?
b. Construct a 90% confidence interval estimate of the difference between the two population proportions.
2. Let n1= 100, X1= 45, n2= 50, and X2= 25.
a. At the 0.01 level of significance, is there evidence of a significant difference between the two population proportions?
b. Construct a 99% confidence interval estimate for the difference between the two population proportions.
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