Answered: An experiment was performed to compare…

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

An experiment was performed to compare the abrasive wear of two different laminated
materials. Twelve pieces of material 1 were tested by exposing each piece to a machine measuring wear.
Ten pieces of material 2 were similarly tested. In each case, the depth of wear was observed. The
samples of material 1 gave an average wear of 85 units with a sample standard deviation of 4, while the
samples of material 2 gave an average of 81 units and a sample standard deviation of 5. Can we
conclude at the 0.05 level of significance that the abrasive wear of material 1 exceeds that of material 2
by more than 2 units? Assume that the population to be approximately normal with potentially unequal
variances.

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