What is a plank in a party's platform?

question 13 options:

a controversial position that divides the party

an overall mission statement of the party

a principle that guides the choice of candidates

a statement of position on one issue

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.