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A consumer group wants to estimate the mean electric bill for the month of Julyforsingle-family homes in a large city. Based on studies conducted for
A consumer group wants to estimate the mean electric bill for the month of Julyforsingle-family homes in a large city. Based on studies conducted for othercities, the standard deviation is assumed to be $36. The group wants toestimate, with99% confidence, the mean bill forJulyto within $6.
a. What sample size isneeded?
b. If95% confidence isdesired, how many homes need to beselected?
a.The sample size required for99% confidence is
b. The sample size required for95% confidence is
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