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the average selling price of a smartphone purchased by a random sample of 46 customers was...

the average selling price of a smartphone purchased by a random sample of 46 customers was $317. Assume the population standard deviation was $32.

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?
math   Statistics-And-Probability   
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