Use the 5 step method and discuss type 1 and type 2 error. 1. An article on CNN reports that Americans are increasingly skimping on their sleep. A researcher wants to determine if Americans are sleeping less than the recommended 7 hours a night. He takes a random sample of 150 Americans and computes the average sleep time of 6.7 hours a night. The standard deviation is known to be 2.1 hours. The level of significance is .01.