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When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A...

When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A sample of 40 smokers has a mean cotinine level of 172.5 ng/ml. Assuming the σ is known to be 119.5 ng/ml, find the following: (6 pts)

a) A 90% confidence interval estimate of the mean cotinine level of all smokers.

b) A 98% confidence interval estimate of the mean cotinine level of all smokers.

c) A 92% confidence interval estimate of the mean cotinine level of all smokers.

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Given that, sample size (n) = 40

sample mean =172.5 ng/ml

Population standard deviation = 119.5 ng/ml

Using TI-84 calculator we get the following confidence interval estimates.

a) A 90% confidence interval estimate of the mean cotinine level of all smokers is , (141.42, 203.58)

b) A 98% confidence interval estimate of the mean cotinine level of all smokers is, (128.54, 216.46)

c) A 92% confidence interval estimate of the mean cotinine level of all smokers is, (139.42, 205.58)

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