Answered: A study was conducted to determine if a…

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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A study was conducted to determine if a certain treatment has any effect on the amount of metal
removed in a pickling operation. A random sample of
100 pieces was immersed in a bath for 24 hours without
the treatment, yielding an average of 12.2 millimeters
of metal removed and a sample standard deviation of
1.1 millimeters. A second sample of 200 pieces was
exposed to the treatment, followed by the 24-hour immersion in the bath, resulting in an average removal
of 9.1 millimeters of metal with a sample standard deviation of 0.9 millimeter. Compute a 98% confidence
interval estimate for the difference between the population means. Does the treatment appear to reduce the
mean amount of metal removed?

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