You are interested in investigating the effectiveness of intervention programs f

Question

You are interested in investigating the effectiveness of intervention programs for preventing sexually transmitted infections (STT's) in teens and young adults. You plan to have three treatment groups- one that includes group discussions and role-playing, one that includes only provision of medical information, and one that has no intervention (control). Participants will be between ages 15 and 25 who come to the health department for contraceptives. You plan to divide subjects into three age groups to ensure intervention material can be age-appropriate, particularly in the group sessions. You want to be certain that age does not confound your findings (ie., if younger individuals are more likely to engage in riskier practices, you don't want that fact to distort any difference in treatment effects). 4. How do you design the study to ensure age does NOT become a confounder, while maintaining maximum external validity? a. You only enroll males b. You enroll only teens age 15-18 c. You block enrollment by gender to ensure all males are in the same treatment group d. You block enrollment by age to ensure all 15-18 year olds are in the same treatment group e. You block enrollment by gender to ensure males are equally distributed among treatment groups f You block enrollment by age to ensure all age groups are equally distributed among treatment groups

Explanation / Answer

4. How do you design the study to ensure age does NOT become a confounder, while maintaining maximum external validity?

A distinction can be made between internal and external validity. These types of validity are relevant to evaluating the validity of a research study or procedure. Internal validity refers to whether the effects observed in a study are due to the manipulation of the independent variable and not some other factor.

So, you block enrollment by age to ensure all age groups are equally distributed among treatment groups.

Option- (f).

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