12. The average monthly electricity use per household in the USA is 910 kW'h. A local util ity company wants to know Whether the average use within the population it serves exceeds the national average. In a random sample of 100 households the average monthly electricity use was 920 kW'h. with a sample standard deviation 50 k1Wh. a. Use a onesided test to decide whether the average electricity use within the local popu lation exceeds the national average. Select the signicance level 0' = .05. b. Repeat the same test as in part (a), using Cr : .01. c. 1Without calculating the pvalue. what can you say about it. based on your answers to parts (a) and (b). Help: your answer should be of the form ='the pvalue is less than a certain number, and larger than another number". Give a reason for your answer. :1 d. Make a decision for the same test as above with a = .1, without any calculation. e. Make a decision for the same test as above with o: = .005, without any calculation