Answered: A researcher wishes to see if there is…

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

A researcher wishes to see if there is a difference in the cholesterol
levels of two groups of men. A random sample of 30 men between
the ages of 25 and 40 is selected and tested. The average level is
223. A second random sample of 25 men between the ages of 41
and 56 is selected and tested. The average of this group is 229. The
population standard deviation for both groups is 6. At α = 0.01, is
there a difference in the cholesterol levels between the two groups?
Estimate the 99% confidence interval for the difference of the two
means.

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