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AP® Statistics

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Drawing Conclusions: Smokers

APSTAT-EMWAK2

A researcher decided to analyze the weights of smokers and non-smokers.

Suppose a random sample of $100$ smokers averages $196.4$ lbs with a standard deviation of $6.5$ lbs, and a random sample of $100$ non-smokers averages $174.5$ lbs with a standard deviation of $4.6$ lbs.

What conclusions could be drawn when comparing smokers to non-smokers?

A

Smokers tend to weigh more.

B

Smoking may cause weight gain.

C

Who weighs more is inconclusive evidence since this was not an experiment.

D

Who weighs more is inconclusive evidence since the sample sizes were too small.

E

Who weighs more is inconclusive evidence since the differences could have easily happened by chance.