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Chapter 10 7)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 7.5 with a sample standard deviation of 1.7. Seven specimens of treated wastewater had an average benzene concentration of 3.3 with a standard deviation of 1.6. It is reasonable to assume that both samples come from populations that are approximately normal. Construct an 80 % confidence interval for the reduction in benzene concentration after treatment. Round the final answer to one decimal place.

Chapter 10 7)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 7.5 with a sample standard deviation of 1.7. Seven specimens of treated wastewater had an average benzene concentration of 3.3 with a standard deviation of 1.6. It is reasonable to assume that both samples come from populations that are approximately normal. Construct an 80 % confidence interval for the reduction in benzene concentration after treatment. Round the final answer to one decimal place.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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Chapter 10 7)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 7.5 with a sample standard deviation of 1.7. Seven specimens of treated wastewater had an average benzene concentration of 3.3 with a standard deviation of 1.6. It is reasonable to assume that both samples come from populations that are approximately normal. Construct an 80 % confidence interval for the reduction in benzene concentration after treatment. Round the final answer to one decimal place. 8
Transcribed Image Text:Chapter 10 7)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 7.5 with a sample standard deviation of 1.7. Seven specimens of treated wastewater had an average benzene concentration of 3.3 with a standard deviation of 1.6. It is reasonable to assume that both samples come from populations that are approximately normal. Construct an 80 % confidence interval for the reduction in benzene concentration after treatment. Round the final answer to one decimal place. 8
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