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An important factor in selling a residential property is the number of times real estate agents show a home. A sample of 21 homes recently

An important factor in selling a residential property is the number of times real estate agents show a home. A sample of 21 homes recently sold in the Buffalo, New York, area revealed the mean number of times a home was shown was 23 and the standard deviation of the sample was 8 people.

a. What is the margin of error for a 99% confidence interval? (Round your answers to 3 decimal places.)

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