Answered: The concentration of benzene was…

Name: The concentration of benzene was measured in units of milligrams per l
Uploaded: 2024-03-20T07:07:12.000Z
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Description: The concentration of benzene was measured in units of milligrams per liter for a simple random sample of seven specimens of untreated wastewater produced at a gas field. The sample mean was 7.7 with a sample standard deviation of 1.3. Nine specimens

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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The concentration of benzene was measured in units of milligrams per liter for a simple random sample of seven specimens of untreated wastewater produced at a gas field. The sample mean was 7.7 with a sample standard deviation of 1.3. Nine specimens of treated wastewater had an average benzene concentration of 3.5 with a standard deviation of 1.5. It is reasonable to assume that both samples come from populations that are approximately normal. Construct a 95% confidence interval for the reduction in benzene concentration after treatment.

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