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The owner of a store wants to estimate the mean time customers spend in their store per visit. The manager found a 90% confidence interval

The owner of a store wants to estimate the mean time customers spend in their store per visit. The manager found a 90% confidence interval to be (5 minutes, 16 minutes) using a random sample of 64 customers.

a) Interpret this confidence interval.

b) Would the 90% confidence interval be narrower or wider if the sample size decreased to 49 customers? Briefly explain.

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