Answered: Sample surveys conducted in a large…

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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Sample surveys conducted in a large county in a cer-
tain year and again 20 years later showed that originally

the average height of 400 ten-year-old boys was 53.8
inches with a standard deviation of 2.4 inches, whereas
20 years later the average height of 500 ten-year-old boys
was 54.5 inches with a standard deviation of 2.5 inches.
Use the four steps in the initial part of Section 1 and
the 0.05 level of significance to test the null hypothesis
μ1 − μ2 = −0.5 against the alternative hypothesis μ1 −
μ2 < −0.5.

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