I need help on the following questions, I want to make sure I have selected the correct answers.

I think the answers are:

1. True

2. a,c,d

3. True

4. b,c

1. Once selection bias or information bias has occurred in a study there is no way to adjust for it or correct for it. All one can do is try to figure out whether the bias would cause an overestimate or an underestimate of the association being measured? (True or False)

a. True

b. False

2. Which of the following are rules that should be adhered to in order to avoid selection bias in a case-control study? (Select all that apply.)

a. Controls must come from the same source population as the cases and must be representative of the exposure distribution in the source population.

b. There must be equal numbers of cases and controls.

c. Controls must be selected independently from exposure, meaning that whether or not a person is exposed or unexposed should not influence selection or enrollment of a control subject.

d. It is always necessary to blind the interviewers.

3. Self-selection bias can be minimized in a case-control study if the subjects are informed about the general topic of study but are kept "blinded" regarding the research hypothesis that is being studied. (True or False)

a. True

b. False

4. Which of the following are types of differential misclassification bias? (Select all that apply.)

a. Differential loss to follow up

b. Recall bias

c. Interviewer bias

d. The healthy worker effect