Carlos asks laura to write down her phone number and e-mail address. he promptly loses the slip of paper. however, he finds that he stills remembers them both. this is possible because

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.