Exercise 6.9 (image attached) presents the results of a poll evaluating support for a generically branded “National Health Plan” in the United States. 79% of 347 Democrats and 55% of 617 Independents support a National Health Plan.
(a) Calculate a 95% confidence interval for the difference between the proportion of Democrats and Independents who support a National Health Plan (pD − pI ), and interpret it in this context. We have already checked conditions for you.
(b) True or false: If we had picked a random Democrat and a random Independent at the time of this poll, it is more likely that the Democrat would support the National Health Plan than the Independent.
