The mean consumption of water per household in a city was 1211 cubic feet per month. Due to a water shortage because of a drought, the cityIr council campaigned for water use conservation by households. A few months after the campaign was started. the mean consumption of water for a sample of as households was found to be 1152 cubic feet per month. The population standard deviation is giyen to be 240 cubic feet. a. Find the pyalue for the hypothesis test that the mean consumption of water per household has decreased due to the campaign by the city council. 1ll'll'ould you reject the null hypothesis at a = 0.025? Round your answer to four decimal places. .. b. Make the test of part 3 using the criticalvalue approach and or = {1025. Round your answer for z to two decimal places