A researcher measures responsiveness to a drug treatment in patients who volunteered or were mandated to participate. One problem that arises is that many patients drop out of the program before the study is completed. a. What type of threat to validity does this example illustrate if dropout rates are the same among volunteer and mandated patients? Is this a threat to internal or external validity?b. What type of threat to validity does this example illustrate if dropout rates differ between volunteer and mandated patients? Is this a threat to internal or external validity?
What will be an ideal response?
(a) homogeneous attrition; this is a threat to external validity. (b) heterogeneous attrition; this is a threat to internal validity.
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