certified image consultant advertises that in her diet plan the mean weight loss for people  on their plan is at least 20 pounds in 3 months. A sample of 40 people on this plan loses an  average of 15 pounds with a standard deviation of 10 pounds. Does this result provide enough evidence for you to conclude that the claim is too high? Use  α = .01. Assume weights are normally distributed.

MATLAB: An Introduction with Applications
6th Edition
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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A certified image consultant advertises that in her diet plan the mean weight loss for people 
on their plan is at least 20 pounds in 3 months. A sample of 40 people on this plan loses an 
average of 15 pounds with a standard deviation of 10 pounds.
Does this result provide enough evidence for you to conclude that the claim is too high? Use 
α = .01. Assume weights are normally distributed.

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