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Construct a 90 confidence interval to estimate the average

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Reference no: EM13615417

The average selling price of BlackBerry smart phones purchased by a random sample of 35 customers in 2010 was $311. Assume the population standard deviation was $35.

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?

Reference no: EM13615417

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