political poll is assessing the relative strengths of two presidential candidates. A value of + 1 is assigned to every person who states a preference for candidate A and a value of -1 is assigned to anyone who indicates a preference for candidate B. a) Find the sample mean if 60% of those polled indicate a preference for candidate A. b) Write an expression for the

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4 A political poll is assessing the relative strengths of two presidential candidates. A value of + 1 is assigned to every person who states a preference for candidate A and a value of -1 is assigned to anyone who indicates a preference for candidate B.
a) Find the sample mean if 60% of those polled indicate a preference for candidate A.
b) Write an expression for the sample mean as a function of the sample size and the
percentage of those polled that are in favor of candidate A.
c) Find the sample size necessary to estimate the percentage of persons in favor of
candidate A with a standard deviation no greater than 0. 1 %

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