SOLUTION: The Utility company wishes to estimate the percentage of people in the U.S. who use electrical heat in their homes. Past data indicates that 154 out of 700 customers surveyed used

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Question 1179084: The Utility company wishes to estimate the percentage of people in the U.S. who use electrical heat in their homes. Past data indicates that 154 out of 700 customers surveyed used electrical heat. If the company wishes to be 95% confident and accurate within 3%, how large of a sample is needed?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
P = 154/700 = .22
n = %28z%2FME%29%5E2+%28p%281-p%29%29%29
n = %281.96%2F.03%29%5E2+%28.22%28.78%29%29%29 = 732.47 UP TO WHOLE NUMBER: 733