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Mean consumption of water per household

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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 93 households was found to be 1187 cubic feet per month. The population standard deviation is given to be 214 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 α=0.05?

Round your answer to four decimal places.

p-value =

b. Make the test of part a using the critical-value approach and α=0.05.

Round your answer for z to two decimal places.

zobserved =

Reference no: EM132188075

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