UKMLA PLAB AMC USMLE Prometric MCQ

a) kappa measures concordance between test results and gold standard
b) the confidence limit is analogous to 10 standard deviations
c) the Receiver operating characteristics (ROC) curve is obtained by plotting th eprevalence of a disease by the mortality of the same disease
d) randomised trials should contain both a study group and a control group
e) Case-control studies are PROSPECTIVE studies