# Question: The average selling price of BlackBerry smartphones purchased by a

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?

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?

## Answer to relevant Questions

A random sample of 40 taxpayers with adjusted gross incomes of between $ 100,000 and $ 200,000 was drawn. These taxpayers claimed an average of $ 9,922 in medical expenses for the year. Assume the population standard ...Toyota Motor Corporation developed the Scion car model to appeal to young consumers. Toyota claims the average age of a Scion driver is 26 years old. Suppose a random sample of 18 Scion drivers was drawn, and the average age ...Determine the margin of error for a 95% confidence interval to estimate the population mean when σ = 40 for the following sample sizes: a. n = 10 b. n = 30 c. n = 50 Construct a 95% confidence interval to estimate the population mean with = 110 and σ = 30 for the following sample sizes: a. n = 30 b. n = 45 c. n = 60 Determine the sample size needed to construct a 90% confidence interval to estimate the population mean when σ = 75 and the margin of error equals 12.Post your question