________ is a statistical design in which the test units are blocked on the basis of an external variable to ensure that the various experimental and control groups are matched closely on that variable.
A)Randomized block design
B)Latin square design
C)Factorial design
D)Solomon four-group design

Question

Quizplus · Accepted Answer

The randomized block design is specifically designed to control for variability due to an external variable that might impact the outcome of the study. This is done by dividing the units into blocks based on the external variable, and then randomly assigning treatments within each block. This ensures that any differences between the treatment groups are not due to differences in the external variable, but rather the actual treatment itself.

________ Is a Statistical Design in Which the Test Units