2) The mean length of the lumber is supposed to be 8.5 feet. A builder wants to check whether the shipment of lumber she receives has a mean length different from 8.5 feet. If the builder observes that the sample mean of 61 pieces of lumber is 8.3 feet with a sample standard deviation of 1.2 feet, what will she conclude? Assuming normality, conduct this test at a 5% level of significance
2) The mean length of the lumber is supposed to be 8.5 feet. A builder wants to check whether the shipment of lumber she...