1.Name one limitation when using the Mantel-Haenszel method to control for confounding in case-control studies.

2.Name one limitation when using matching to control for confounding in a case-control study?

2.Name 2 types of censoring that can occur during follow-up in a cohort study or clinical trial.

3.A potential confounding variable should be included in a multiple proportional hazards regression model if ___

a)it is an independent risk factor for the outcome

b)it is a statistically significant predictor for the outcome

c)it differs in frequency between exposed and unexposed study subjects

d)choices a and c

e)choices a and b

f)all of the above