Amanda has been severely depressed in the past year. she is constantly sad, almost to the point of numbness. she ponders constantly about what a failure she is and how nothing she does is ever right. she finds it hard to get out of bed and get going. which of these symptoms is an example of a cognitive symptom of amanda's mental disorder

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.