Professor Valdez wants to examine whether an increase in sunlight causes an increase in memory. In order to examine whether there is a causal relationship between sunlight and memory, she would have to:

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.