A large hat manufacturer, MICHAELLA HATS, is concerned that the mean weight of their signature Kentucky Derby hat is not greater than 3.5 pounds.
It can be assumed that the population standard deviation is .6 pounds based on past experience. A sample of 250 hats is selected and the sample mean is 3.25 pounds.
Using a level of significance of .05, is there evidence that the population mean weight of the hats is greater than 3.5 pounds? Fully explain your answer.
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