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*Chapter 09, Supplementary Exercises, Problem 104 The mean consumption of water per household in a city was 1209 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 94 households was found to be 1150 cubic feet per month. The population standard deviation is given to be 249 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 0' = 0-025 ? Round your answer to four decimal places. D -vaIue = l:*= We Ho. b. Make the test of part a using the critical-value approach and 0' = 0025 . Round your answer for Z to two decimal places. observed 2 = *1 We:IHo. We conclude that the mean consumption of water per household has due to the campaign by the city council