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3. Over a long period of time, it was found that the time taken for the standard physical task is normally distributed with mean 50 seconds, and variance 100 sec?. A sample of 75 workers were given a special and unusual diet for three weeks before they were observed performing said standard physical task. The mean time taken by this sample is 46 seconds. Is this significant evidence that the special diet has made a difference in their performance. Use a 5% level of significance.

3. Over a long period of time, it was found that the time taken for the standard physical task is normally distributed with mean 50 seconds, and variance 100 sec?. A sample of 75 workers were given a special and unusual diet for three weeks before they were observed performing said standard physical task. The mean time taken by this sample is 46 seconds. Is this significant evidence that the special diet has made a difference in their performance. Use a 5% 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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3. Over a long period of time, it was found that the time taken for the standard physical task is normally distributed with mean 50 seconds, and variance 100 sec?. A sample of 75 workers were given a special and unusual diet for three weeks before they were observed performing said standard physical task. The mean time taken by this sample is 46 seconds. Is this significant evidence that the special diet has made a difference in their performance. Use a 5% level of significance.
Transcribed Image Text:3. Over a long period of time, it was found that the time taken for the standard physical task is normally distributed with mean 50 seconds, and variance 100 sec?. A sample of 75 workers were given a special and unusual diet for three weeks before they were observed performing said standard physical task. The mean time taken by this sample is 46 seconds. Is this significant evidence that the special diet has made a difference in their performance. Use a 5% level of significance.
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