A Pollster Plans To Survey A Random Sample Of Voters In A Certain City To Ask Whether They Support An Increase In Proper 1 (44.77 KiB) Viewed 39 times
A pollster plans to survey a random sample of voters in a certain city to ask whether they support an increase in property taxes to fund the construction of a new elementary school. How many voters should be sampled to be sure that a 95% confidence interval for the proportion who favor the proposal specifies that proportion to within +0.01? 9604 X
During a recent drought, a water utility in a certain town sampled 100 residential water bills and found that 72 of the residences had reduced their water consumption over that of the previous year. Find the sample size needed for a 95% confidence interval to specify the proportion to within ±0.04. Round up the answer to the nearest integer. 474 X
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