The average selling price of an iPhone purchased by a random sample of 35 customers was $796.

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The average selling price of an iPhone purchased by a random sample of 35 customers was $796. Assume the population standard deviation was $90.

a. Construct a 90% confidence interval to estimate the average selling price in the population with this sample.

b. What is the margin of error for this interval?

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Business Statistics

ISBN: 9780134685267

3rd Edition

Authors: Robert A. Donnelly

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