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The mean consumption of water per household in a city was 1236 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 1187 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 a = 0.025? Round your answer to four decimal places. p-value = i We v Họ. 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 i We v Ho. We conclude that the mean consumption of water per household has due to the campaign by the city council.

The mean consumption of water per household in a city was 1236 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 1187 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 a = 0.025? Round your answer to four decimal places. p-value = i We v Họ. 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 i We v Ho. We conclude that the mean consumption of water per household has due to the campaign by the city council.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The mean consumption of water per household in a city was 1236 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 1187 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 a = 0.025? Round your answer to four decimal places. p-value = i We v Họ. 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 = i We v Ho. We conclude that the mean consumption of water per household has due to the campaign by the city council.
Transcribed Image Text:The mean consumption of water per household in a city was 1236 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 1187 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 a = 0.025? Round your answer to four decimal places. p-value = i We v Họ. 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 = i We v Ho. We conclude that the mean consumption of water per household has due to the campaign by the city council.
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