Question

1-Differential misclassification can bias study results in which direction?

		Towards the null
		Away from the null
		Either towards or away from the null

2-If a subjects' willingness to participate is related to both their exposure status and disease status, the resulting bias is known as

		Control-selection bias
		Interviewer/recording bias
		Self-selection bias
		Surveillance, diagnostic, or referral bias

3-If systematic bias, confounding, and random error have been ruled out as alternative explanations, the investigator may conclude that the association is true, and that the study has internal validity.

		True
		False

  

4-Information or observation bias occurs

		During the selection and follow-up of study participants
		During data collection
		Both of the above
		None of the above

Answer 1

Answer:

3) TRUE

4) BOTH OF THE ABOVE

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