. Selling prices of single-family homes in Seattle, Washington, are based on land values and structural improvements. You collected data on 28 recent single-family home sales in Seattle. Specifically, you recorded the selling price (in $000s) and size (in square feet) of each home. You then conducted a simple regression analysis to explain variation in selling price as a function of home size

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.