Sam echols was injured when he was struck in a crosswalk by a car driven by becky samuels. echols' lawyer suspects that ms. samuels was not wearing her contact lenses at the time of the accident as she is required to do by law. after echols' lawyer files suit, how can she find out whether ms. samuels was wearing her contact lenses?

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.