Question 915321: In a sample size of 7 cars, each car was tested for nitrogen oxide emissions, and the following results were obtained. 0.14, 0.08, 0.17, 0.16, 0.08, 0.07, 0.14. Assuming that this sample is representative of the cars in use, construct a 98% confidence interval estimate of the mean amount of nitrogen oxide emissions for all cars. If the EPA requires that nitrogen oxide emissions be less than 0.165 g/mi, can we safely conclude this requirement is being met?
What is the confidence interval estimate of the mean of nitrogen oxide emissions for all cars?
_____g/mi < u < ____g/mi
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! 0.14, 0.08, 0.17, 0.16, 0.08, 0.07, 0.14
mean = .12
sd = .042
ME = 2.326(.042/srt(7)) = .037
(.12-ME)g/mi < u < (.12+ME)g/mi
.083g/mi < u < .157g/mi
Requirements met: < .165
Wlll leave checking the arithmetic up to you
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