An advertising company wishes to estimate the mean household income for all single working professionals who own a foreign automobile. If the advertising company wants a 90% confidence interval...

Extracted text: An advertising company wishes to estimate the mean household income for all single working professionals who own a foreign automobile. If the advertising company wants a 90% confidence interval estimate with a margin of error of 1 2200, what sample size is needed if the population standard deviation is known to be $26,500? The sample size must be at least (Round up to the nearest whole number.)