Q 91

________ 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

Q 92

What is the main limitation of randomized block designs?
A)They require an equal number of rows, columns, and treatment levels, which is sometimes problematic.
B)They do not allow the researcher to examine interactions of the external variables with each other or with the independent variable.
C)The researcher can control for only one external variable.
D)The number of treatment combinations increases multiplicatively with an increase in the number of variables or levels.

Q 93

________ is a statistical design that allows for the statistical control of two non-interacting external variables in addition to the manipulation of the independent variable.
A)Randomized block design
B)Latin square design
C)Factorial design
D)Solomon four-group design