Cross-product ratio is estimated by ?
Ans. is 'b' i.e., Case-control studyOdds - ratio (cross product ratio)From a case control study odds ratio can be derived which a measure of the strength of association between risk factor and outcome.Odds ratio is closely related to relative risk (which is analysed in coho study) 4 odds ratio represents only an estimate of relative risk.
Coho study
Case-control study
Cross sectional study
Field trial