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A consumer group wants to estimate the mean electric bill for the month of April for single-family homes in a large city. Based on studies conducted for other cities, the standard deviation is assumed to be $24. The group wants to estimate, with 99% confidence, the mean bill for April to within $4 a. What sample size is needed? b. If 95% confidence is desired, how many homes need to be selected? Click the icon to view a table of values for the standardized nomal distribution. a. The sample size required for 99% confidence is (Round up to the nearest integer.) b. The sample size required for 95% confidence is (Round up to the nearest integer.)

math   Statistics-And-Probability   
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