The mean consumption of water per household in a city was 1232 cubic feet per month. Due to a water shortage because of a drought, the city 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 91 households was found to be 1158 cubic feet per month. The population standard deviation is given to be 227 cubic feet. a. Find the p-value for the hypothesis test that the mean consumption of water per household has decreased due to the campaign by the city council. Would you reject the null hypothesis at a = 0025? Round your answer to four decimal places. pvalue = n We H0 . b. Make the test of part a using the critical-value approach and a = 0.025. Round your answer for z to two decimal places. Zobserved = n We H0. We conclude that the mean consumption of water per household has due to the campaign by the city council