Question

Please Use R studio to answer the question. This is the Statistics section of Comparing Groups.

One month before the election, a poll of 630 randomly selected votes showed 54% planning to vote for a certain candidate. A week later, it became known that he had had an extramarital affair, and a new poll showed only 51% of 1010 voters supporting him. Do these results indicate a decrease in voter support fo his candidacy?

a) Test an appropriate hypothesis as state your conclusion.

b) If you concluded there was a difference, estimate that difference with a confidence interval and interpret your interval in context.

Answer 1

Let denote the proportion voters supporting him before and after respectively.

a)

There is not sufficient evidence to support the claim that there is a decrease in voter support fo his candidacy.

b)

With 95% confidence, it can be concluded that true difference in proportions will lie between (-0.012, 0.072) .