The first of two sub-groups has 100 items withemean 15 and S.D. 3. If the whole group has 250 items with mean 15.6and S.D.√13.44 find the S.D. of the second group.

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Answered: The first of two sub-groups has 100…

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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At a local food processing plant, it used to take an average of 90 minutes for new workers to learn a food processing job. Recently the company installed a new food processing machine. The supervisor at the company wants to find if the mean time taken by new workers to learn the food processing procedure on this new machine is different from 90 minutes. A sample of 20 workers showed that it took, on average, 85 minutes for them to learn the food processing procedure on the new machine. It is known that the learning times for all new workers are normally distributed with a population standard deviation of 7 minutes. Use a significance level of 0.01 to test the claim that the mean time is different from 90 minutes. What is the test statistic? A) -7.01 B) -2.539 C) -3.19 D) -2.528 E) -1.96

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The first of two sub-groups has 100 items with mean 15 and S.D. 3. If the whole group has 250 items with mean 15.6 and S.D.V13.44 find the S.D. of the second group.