review different types of bias, present an example of a study, and discuss whether bias was a factor in the study outcome. Discuss how the study design could have been altered to minimize or eliminate the risk of invalidating the results.

To prepare for this Discussion:
• Review the types of bias listed below.
o Non-differential recall bias
o Differential recall bias
o Publication bias
o Loss to follow-up
o Refusal to participate
o Interviewer bias
o Confounding
Select one type of bias from the list above, and consider the ways that bias could impact a study.

To complete this Discussion, post a real or hypothetical example of one study by Day 4. You can use one of the studies you designed during Weeks 3 or 4 or search for a different study.

• How could bias be introduced in the study?

• Would the bias be considered a selection bias or an information bias? Why?

• Name two or three variables that might be possible confounders in your study.

• Describe at least one method of controlling those confounding variables.

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