Answered: A certain chemical pollutant in the…

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 certain chemical pollutant in the Genesee River has been polluted for many years and mean
pollution was 34 ppm (parts per million) and population standard deviation σ= 8 ppm. The
population standard deviation is skewed to the left. A group of factory representatives whose
companies discharge liquids into the river is saying that they have lowered the average with
improved filtration devices. Test if the pollution remains same or not at 4% level of significance.
Assume that their sample size of 50 gives a mean of 32.5 ppm. Perform a hypothesis test at the
4% level of significance and using critical value approach state your decision. (Draw graph).

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