Question: The cotinine levels summarized in the table that accompanies Exercise 6 are obtained from a simple random sample of smokers selected from the population of

The cotinine levels summarized in the table that accompanies Exercise 6 are obtained from a simple random sample of smokers selected from the population of all smokers. If we add the original 40 cotinine levels, then divide the total by 40, we obtain 172.5, which is the average (mean). Is 172.5 a statistic or a parameter? In general, what is the difference between a statistic and a parameter?

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