Recently, Twitter users were asked by a polling company if they approve of the job President Biden is doing. They wanted to know if President Biden’s approval rating changed from his first day in office to his 100th day in office. According to the poll of 1400 Twitter users, 756 approved of Biden’s job performance on his first day. In another poll of 1600 users taken on his 100th day in office, 720 approved of his job performance. Assume that both polls are independent random samples. a. Construct and interpret a 95% confidence interval for the change in true
proportions of Twitter users who approved of Biden’s performance (100th day-1st day). Use the 4-Step-Process.

Based on the confidence interval in part a, what conclusion can you make about
whether Biden’s approval rating has changed. Justify your answer.