What is the veracity of the claim that college students smoke less than the general public from the given information. Why would college graduates smoke at a lower rate than others?

A survey showed that among 785 randomly selected subjects who completed four years of college, 18.3 smoke and 81.7 do not smoke. Using a 0.01 significance level test the claim that the rate of smoking among those with four years of college is less than the 27% rate of the general population.

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The survey shows that of the 785 randomly selected subjects that have completed 4 years of college, 18.3% smoke and 81.7% do not smoke. The confidence interval with a 0.01 significance level is given by `2.575*sqrt((0.183*0.817)/785) = 0.0355`

This gives the percentage of the population that smokes lying between `18.3%+-3.55%` or at the higher end 21.85% of the population of students having completed 4 years of college smokes. At a 99% confidence level this is significantly lower than the 27% rate of people in the general public that smoke .

A possible reason why college graduates have a lower rate of smoking could be because they are more aware of the risks involved and know that smoking is medically proven to be injurious to health.

**Sources:**

Or graduate students more intelligent, as smoking has been proven to lower one's cognitive function and IQ.

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