The internal revenue service is auditing the operators of some 13,000 private airports by taking a random sample of 100 of them. The IRS discovers an average error in reported taxable income of $14,750, and the population standard deviation is known to be $3,600. Determine a 90 percent confidence interval for the average error made by all the existing airports.
Please use the attachments provided and not only excel functions.
Solution. Given sample mean xbar=$14,750, population standard deviation sigma=$3,600, n=100. For a 90% ...
This Solution determines a 90 percent confidence interval for the average error made by all the existing airports as requested and provides the necessary calculations.