Which of the following experimental designs would have the strongest external validity?
a. One-group pretest-posttest design
b. Randomized subjects, posttest-only, control-group design
c. Randomized subjects, pretest-posttest, control-group design
d. Nonrandomized pretest-posttest, control-group design
Question 2
Distinguish between score validity and reliability.
What will be an ideal response?