(11). The weekly mean amount of household trash was reported to be 45 lbs. There is a growing concern that people is generating much trash now. A random sample of 9 households were selected. The sample mean is 48 lbs. Assume the weekly amount of household trash is normal with standard deviation 0' = 5 lbs. 1(6). Use the Pvalue method to test if the weekly mean amount of household trash increases. Let significance level be 0.01. 2(5). Follow the above hypothesis test, calculate the probability of type II error 3(50)