13. Contaminated water: The concentration of benzene was atlu291 measured in units of milligrams per liter for a simple random sample of five specimens of untreated wastewater produced at a gas field. The sample mean was 7.8 with a sample standard deviation of 1.4. Seven specimens of treated wastewater had an average benzene concentration of 3.2 with a standard deviation of 1.7. It is reasonable to assume that both samples come from populations that are approximately normal. Can you conclude that the mean benzene concentration is less in treated water than in untreated water? Use the a= 0.05 level of significance.
13. Contaminated water: The concentration of benzene was atlu291 measured in units of milligrams per liter for a simple random sample of five specimens of untreated wastewater produced at a gas field. The sample mean was 7.8 with a sample standard deviation of 1.4. Seven specimens of treated wastewater had an average benzene concentration of 3.2 with a standard deviation of 1.7. It is reasonable to assume that both samples come from populations that are approximately normal. Can you conclude that the mean benzene concentration is less in treated water than in untreated water? Use the a= 0.05 level of significance.
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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Transcribed Image Text:13. Contaminated water: The concentration of benzene was
measured in units of milligrams per liter for a simple random
sample of five specimens of untreated wastewater produced at a
gas field. The sample mean was 7.8 with a sample standard
deviation of 1.4. Seven specimens of treated wastewater had an
arlu251 n
average benzene concentration of 3.2 with a standard deviation
of 1.7. It is reasonable to assume that both samples come
from populations that are approximately normal. Can you
conclude that the mean benzene concentration is less in treated
water than in untreated water? Use the a = 0.05 level of
significance.
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