A study was conducted to determine the effect of cigarette smoking on the carbon monoxide diffusing capacity of the lungs. The carbon monoxide diffusing capacities for a random sample of 20 current smokers are listed below. a. Construct a 90% confidence interval for the mean carbon monoxide diffusing capacity of current smokers. Interpret the result. b. Based on the interval in (a), would you agree that the mean diffusing capacity could be 95? Explain.

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