4.A news channel is conducting an exit poll, asking voters leaving a polling site how they voted.At one location, 200 people were questioned and 56 said they voted yes for proposition B.We want a 95% confidence interval for the proportion of all voters who voted yes for proposition B.

a)(4 pts)Show that the sample size is large enough to use ourmethods.

b)(5 pts) Show how you compute the margin of error for a 95% confidence interval by hand. (Round your answer to 3 decimal places.)

c) (4 pts)What is the 95% confidence interval?(Round the end points to 2 decimal places.)

d)(5 pts) Write one sentence describing what your confidence interval means.