# The average selling price of BlackBerry smartphones purchased by a random sample of 35 customers was $ 311. Assume the population standard deviation was $ 35. a. Construct a 90% confidence interval to estimate the average selling price in the

The average selling price of BlackBerry smartphones purchased by a random sample of 35 customers 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?

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