Real difference or variation?

Statistics
Tutor: None Selected Time limit: 1 Day

Simple random sample of 700 people. Percentage of smokers dropped from 36.9% to 31.9% between 1985 and 1992. Is this difference real, or a chance of variation. I believe it to be a chance of variation, but want to double check.

Mar 20th, 2015

it is a chance of variation............................................................................please best my answer

Mar 20th, 2015

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Mar 20th, 2015
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Mar 20th, 2015
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