Which of the following statements is true of random assignment and random sampling?
A)Random assignment is necessary for internal validity, whereas random sampling is necessary for external validity.
B)They both are necessary for frequency claims.
C)They both mean the same thing.
D)Random sampling is more important than random assignment.

Question

Quizplus · Accepted Answer

Random assignment is necessary for internal validity because it helps ensure that any observed effects of the independent variable on the dependent variable are actually due to the manipulation of the independent variable, rather than to preexisting differences between groups. Random sampling, on the other hand, is necessary for external validity because it helps ensure that the sample of participants is representative of the population of interest and therefore generalizable to that population.

Which of the Following Statements Is True of Random Assignment