I am having trouble with the following questions.

I think the answers are as follows, but want to double check:

1. c

2. a, c

1. Which of the following methods can be used to reduce information bias when subjects may have difficulty remembering their past exposures accurately?

a. Increase the sample size

b. Use pre-existing records to obtain information or verify information regarding

past exposures.

c. Select case and control by the same method

d. Do whatever is necessary to encourage high participation rates in all

exposure-disease categories

2. Which of the following are useful ways of reducing selection bias? (select all that apply)

a. increase sample size

b. Do whatever is possible to achieve high participation rates in all exposure-

disease categories in a case-control study.

c. Select cases and controls by the same selection procedure (except that

controls do not have the outcome of interest).

d. Do whatever is feasible to maintain high follow up rates in a prospective

cohort study.