Author Question: The type of experimental design that allows us to examine the effects of more than one independent ... (Read 103 times)

joe · **on:** Jun 20, 2018

The type of experimental design that allows us to examine the effects of more than one independent variable both individually and collectively is called:

a. between-subjects design.
b. multileveled completely randomized design.
c. factorial design.
d. within-subjects design.

Question 2

A professor was interested in whether caffeine affected test performance. To test this possibility, he gave students a test and asked them whether they had consumed caffeine in the hour before the test. He then compared the performance of those students who had taken caffeine to those who had not. Why is this not a true experiment?

a. There are not two levels of the independent variables.
b. Participants were not randomly assigned to groups.
c. The study was not performed in the laboratory.
d. The study lacks external validity.