ANTC67H3 Study Guide - Final Guide: Barometer, Standard Score, Pasteurization
Document Summary
Risk factor (present/absent) association disease (yes /no) Indicate whether the observed difference in the two groups can simply be attributed to chance. Common elements are presented in summary form before the actual tests of significance. The expression of the disease is independent (not associated) of the specified risk factor. Compare computed chi square (observed) to expected chi square (critical value) If chi-square value exceeds the expected, reject the null hypothesis of no association there is an association. Critical chi square value: allowing for 5% error in our decision or 95% confident regarding the null hypothesis. Step 2: select the level of statistical significance: once the null hypothesis is stated, a decision be, reject ho, accept ho, reserve judgement concerning ho (the decision is too close to call). Step 3: select the appropriate test statistic: decide which test to use, depends on assuptions.
