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How many computers? In a simple random sample of130 households, the sample mean number of personal computers was2.87.Assume the population standard deviation is= 0.45. (a)

How many computers?

In a simple random sample of130 households, the sample mean number of personal computers was2.87.Assume the population standard deviation is= 0.45.

(a) Construct a99.5% confidence interval for the mean number of personal computers. Round the answer to at least two decimal places.

A99.5%confidence interval for the mean number of personal computers is

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