7.5

A poll asked residents of a certain country in 2016 and 2017 if they were happy. In 2016, 35% reported being happy and in 2017, 39% reported being happy Assume the sample size for each poll was 1000. A 95% confidence interval for the difference in these proportions P, - P2 (where proportion 1 is the proportion happy in 2016 and proportion 2 is the proportion happy in 2017) is ( - 0.08, -0 02) Interpret this confidence interval. Does the interval contain 0? What does this tell us about happiness among residents of this country in 2016 and 2017? The confidence interval V 0, which tells us with V confidence that the proportion of people who reported being happy in 2016 was the proportion of people who reported being happy in 2017