To study the development of relationships, dr. rajiv carefully observed and recorded patterns of verbal and nonverbal behaviors among boys and girls in the school yard. which research method did dr. rajiv employ?

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.