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(Solved): It is recognized that cigarette smoking has a deleterious effect on lung function. In a study of t ...



It is recognized that cigarette smoking has a deleterious effect on lung function. In a study of the effect of cigarette smok

It is recognized that cigarette smoking has a deleterious effect on lung function. In a study of the effect of cigarette smoking on the carbon monoxide diffusing capacity \( (\mathrm{DL}) \) of the lung, researchers found that current smokers had DL readings significantly lower than those of either ex-smokers or non-smokers. The carbon monoxide diffusing capacities for a random sample of \( n=20 \) current smokers are listed here: The above random sample produces a mean of \( 89.85475 \) and a standard deviation of \( 14.9035 \). Do these data indicate that the mean DL reading for current smokers is significantly lower than \( 100 \mathrm{DL} \), the average for non-smokers? Use \( \alpha=0.01 \). a. State the null and altemative hypotheses needed to verify the claim. [2M] b. Test the null hypothesis. Interpret your result in a practical sense. [5M] c. Find a \( 95 \% \) upper one-sided confidence interval for the mean DL reading for current smokers. Does this bound confirm your conclusions in part a? [5M]


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