9. Auto Exhaust and Lead Exposure Researchers interested in lead exposure due to car exhaust sampled the blood of 19 police officers subjected to constant inhalation of automobile exhaust fumes while working traffic enforcement in a primarily urban environment. The blood samples of these officers had an average lead concentration of 11.2µg/dl and a SD of 4.5µg/dl; a previous study of individuals from a nearby suburb, with no history of exposure, found an average blood level concentration of 7.2µg/dl. (a) Test the hypothesis that the downtown police officers have a higher lead exposure than the officers in the previous study. Be sure to interpret your results in context. a = 0.05 (b) Explicitly state and check all conditions necessary for inference on this data. (c) Based on your preceding result, without performing a calculation, would a 90% confidence interval for this difference contain 0? Explain why or why not.
9. Auto Exhaust and Lead Exposure Researchers interested in lead exposure due to car exhaust sampled the blood of 19 police officers subjected to constant inhalation of automobile exhaust fumes while working traffic enforcement in a primarily urban environment. The blood samples of these officers had an average lead concentration of 11.2µg/dl and a SD of 4.5µg/dl; a previous study of individuals from a nearby suburb, with no history of exposure, found an average blood level concentration of 7.2µg/dl. (a) Test the hypothesis that the downtown police officers have a higher lead exposure than the officers in the previous study. Be sure to interpret your results in context. a = 0.05 (b) Explicitly state and check all conditions necessary for inference on this data. (c) Based on your preceding result, without performing a calculation, would a 90% confidence interval for this difference contain 0? Explain why or why not.
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:9. Auto Exhaust and Lead Exposure
Researchers interested in lead exposure due to car exhaust sampled the blood
of 19 police officers subjected to constant inhalation of automobile exhaust fumes
while working traffic enforcement in a primarily urban environment. The blood
samples of these officers had an average lead concentration of 11.2µg/dl and a
SD of 4.5µg/dl; a previous study of individuals from a nearby suburb, with no
history of exposure, found an average blood level concentration of 7.2μg/dl.
(a) Test the hypothesis that the downtown police officers have a higher lead
exposure than the officers in the previous study. Be sure to interpret your results
in context. a = = 0.05
(b) Explicitly state and check all conditions necessary for inference on this
data.
(c) Based on your preceding result, without performing a calculation, would
a 90% confidence interval for this difference contain 0? Explain why or why not.
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