Question text President Franklin D. Roosevelt tried to change the makeup of the Supreme Court by doing which of the following?
Select one:

a.
Changing the tenure of justices

b.
Decreasing the number of justices

c.
Increasing the number of justices

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.