Suppose a recent election exit pollster reports that Forty-eight percent of the voters polled said they voted for Candidate A. The margin of error for this survey is plus or minus 2.5 percentage points.. Assume the exit poll was designed and conducted correctly. What can be concluded about Candidate A?
a. 48 of all voters will vote for Candidate A.
b. We are confident that between 45.5 and 50.5 of all voters will vote for Candidate A. This means he/she will win the election, because 50.5 is more than half of the votes.
c. We are confident that between 45.5 and 50.5 of the voters will vote for Candidate A. The election is too close to call' at this point. It could go either way.
d. None of the above
Q. 2What is the margin of error?
a. The amount of error allowable during the implementation of a survey.
b. The amount of bias you can expect in the survey results.
c. A measure of the accuracy of survey results.
d. None of the above
Q. 3Suppose a recent election exit pollster reports that Forty-eight percent of the voters polled said they voted for Candidate A. The margin of error for this survey is plus or minus 2.5 percentage points.. Assume the exit poll was designed and conducted correctly. What percentage of all voters do you expect to vote for Candidate A? Give the most complete answer you can.
Q. 4Suppose you sampled 2,500 people for a marketing survey, but your boss thinks that you should have sampled more, say 4,000 people, because he says the results would have been much more accurate, even under the tight budget and time constraints on the company. Using statistics, how would you convince your boss to agree with you?
Q. 5With a random sample of 2,500 people, we usually get an estimate that is accurate to within what percent of the truth (using the general rule)?
Q. 6Give three major advantages to using a (well designed and conducted) sample survey rather than a census.
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