The average selling price of a smartphone purchased by a random sample of 37 customers was $304. Assume the population standard deviation was $33. a. Construct a 95% confidence interval to estimate the average selling price in the population with this sample. b. What is the margin of error for this interval? a. The 95% confidence interval has a lower limit of $ (Round to the nearest cent as needed.) b. The margin of error is $ *** and an upper limit of $ (Round to the nearest cent as needed.)

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