Mathematics, 18.12.2020 21:00, Lesquirrel

It is believed that 25% of U. S. homes have a direct satellite television receiver. (Show your work on the back for both parts, since I have not left you enough space, but enter your answer here.) a. How large a sample is necessary to estimate the true population of homes which do with 95% confidence and within 3 percentage points?

b. How large a sample is necessary for a 95% confidence interval to be within 3 percentage points if nothing is known about the proportion?

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