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If the sample size is doubled repeat part a what happened

From a random sample of 48 gas stations in a recent year, U.S. gasoline prices had a mean of $3.63.

A) Assuming the population standard deviation is $0.21, find a 90% confidence interval for the true mean gasoline price for the entire United States.

If the sample size is doubled, repeat part A. What happened to the interval after the sample size was doubled?

Please explain step by step

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Finance Basics: If the sample size is doubled repeat part a what happened

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Finance Basics: If the sample size is doubled repeat part a what happened

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