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Unformatted text preview: die from a stroke or heart attack. Explanatory: whether or not the subject has high blood pressure and binge drink even occasionally or is a teetotaler with normal blood pressure. c. No. There could be a third variable that associates with both high blood pressure/ binge drinking and death from stroke or heat attack. Stratified random sampling. 1 ST1131 Introduction to Statistics a. Subjects are asked to report on their past mobile phone use. b. Cases refer to subjects who had eye cancer, controls refer to subjects who did not ha...
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This document was uploaded on 03/13/2014.
- Spring '14