18For two groups of observations the following results are available :Group IΣ (X- ) 3Group II 2(X-8) = -11E (X-8)²=N2(X-5)24376N1 =1817Find the mean and standard deviation of 35 observations obtained bycombining the two groups.

We have given that, For group-1 Summation(X - 5) =3 Summation(X - 5) ^2= 43 N1= 18 For group-2…

Answered: 18 For two groups of observations the…

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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Question 7 of 9 < -/1 E Current Attempt in Progress The mean consumption of water per household in a city was 1231 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 92 households was found to be 1151 cubic feet per month. The population standard deviation is given to be 248 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 = 0.05? Round your answer to four decimal places. p-value = We Ho- b. Make the test of part a using the critical-value approach and a = 0.05. Round your answer for z to two decimal places. Zobserved = We く Ho. We conclude that the mean consumption of water per household has eTextbook and Media く due to the campaign by the city council.

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18 For two groups of observations the following results are available: Group I E (X – 5) = 3 Group II 2(X-8) = –11 E (X-8)²= Na X-5)2 43 76 N1 =18 17 Find the mean and standard deviation of 35 observations obtained by combining the two groups.