five independent polls of one thousand random people each are taken during the
course of an extremely close election campaign. People in the poll are asked
which of the two candidates they favor and the percentage who favor the
incumbent candidate is computed for each poll.
a. Estimate the standard error and the margin of error for each of these polls.
Justify your answer and briefly explain the differences between them.
b. How large a poll sample would be required if a margin of error of only 10%
c. One of the other candidate’s approval ratings averaged around 48% over all
the twenty five polls. If you computed the standard deviation of the list of
all twenty five poll percentages for this candidate, approximately what number
would you expect to get? Explain.