Expert pool players were observed to make 71 percent of their shots when alone. when four people watched tchem, they made 80 percent of their shots. this best illustrates:
a. the foot-ion-the-door phenomenon
b. social facilitation
c. group polarization
d. the bystander effect
e. the mare exposure effect

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.