Problem 4: 25 points = [9 + 9 + 7] Read Section 10.3 and pay attention to hypothesis testing and pooled estimate for standard deviation of the difference between two sample proportions. Customer satisfaction study is conducted. Customers of Frontier and Time Warner companies were polled about their experiences with Internet services. The summaries are presented in the table below. Provider Sample Size Satisfied Proportion Frontier 200 139 (p) 1 = 5 139 200 2 = 0.6950 Time Warner 400 311 (p) 2 = 311 = 0.7775 Pooled 600 450 p = 450 600 = 0.75 1. Evaluate standard error needed for testing Ho : p1 = p2 about equal satisfaction rate against the alternative H1 : p1