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In a study about time motion, it was revealed that the time required by laborers to finished a specific manual activity was normally distributed with a mean of 26.6 minutes and a standard deviation of 3 minutes. A group of 25 laborers was randomly selected to get a special training for 2 weeks. After the training, it was revealed that their average time to complete the activity was 23 minutes. Can it be concluded that the activity is speed up by special training? Utilize a 0.05 level of significance.

In a study about time motion, it was revealed that the time required by laborers to finished a specific manual activity was normally distributed with a mean of 26.6 minutes and a standard deviation of 3 minutes. A group of 25 laborers was randomly selected to get a special training for 2 weeks. After the training, it was revealed that their average time to complete the activity was 23 minutes. Can it be concluded that the activity is speed up by special training? Utilize a 0.05 level of significance.

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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determine the null & alternative hypothesis + claim. as well as the test statistic and the tail of the distibution.
In a study about time motion, it was revealed that the time required by laborers to finished a specific manual activity was normally distributed with a mean of 26.6 minutes and a standard deviation of 3 minutes. A group of 25 laborers was randomly selected to get a special training for 2 weeks. After the training, it was revealed that their average time to complete the activity was 23 minutes. Can it be concluded that the activity is speed up by special training? Utilize a 0.05 level of significance.
Transcribed Image Text:In a study about time motion, it was revealed that the time required by laborers to finished a specific manual activity was normally distributed with a mean of 26.6 minutes and a standard deviation of 3 minutes. A group of 25 laborers was randomly selected to get a special training for 2 weeks. After the training, it was revealed that their average time to complete the activity was 23 minutes. Can it be concluded that the activity is speed up by special training? Utilize a 0.05 level of significance.
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