Find a large random sample of canadians is selected
Problem
According to Stats Canada, 13.3% of Canadians in 2015 were considered "low income". A researcher believes that number has changed since that time. A large random sample of Canadians is selected to test the researcher's claim.
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How many men should be surveyed to be 95% confident that the sample percentage is in error by no more than 4 percentage points?
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A researcher believes that number has changed since that time. A large random sample of Canadians is selected to test the researcher's claim.
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An effect of exposure was identified, but you fear a covariate could have caused the effect. What should he do to assess?
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