Gerard went out for dinner and watched a horror movie with his parents at the cinemas. the next morning, he woke up sweating and scared after having dreamt of the ghost in the movie. gerard experienced a:

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.