# Question

A market-research organization wants to estimate the mean amounts of time in a week that television sets are in use in households in a city that contains 65 precincts. A simple random sample of 10 precincts was selected, and every household in each sampled precinct was questioned. The following results were obtained:

a. Find a point estimate of the population mean amount of time that televisions are in use in this city.

b. Find a 90% confidence interval for the population mean.

a. Find a point estimate of the population mean amount of time that televisions are in use in this city.

b. Find a 90% confidence interval for the population mean.

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