Igor wanted to do an experiment testing the effects of a new classroom strategy for teaching reading on the reading skills of elementary school students.He used random assignment and wanted to make sure that neither the subjects nor the experimenters knew which was the experimental group and which was the control group.It would be best to use the
A)ex post facto design.
B)static-group comparison.
C)one-group pretest-posttest design.
D)double-blind design.
E)Solomon 4-group design

Question

Quizplus · Accepted Answer

The double-blind design is the best choice as it ensures that neither the subjects nor the experimenters know which group is the experimental or control group, thus reducing bias and increasing the validity of the results. The other designs listed do not protect against experimenter or subject bias.

Igor Wanted to Do an Experiment Testing the Effects of a New