Question

1. which one of the following answer options best represents the basic principles of experimental design?

a. controlling sources of variation, using replication with enough subjects, and ensuring treatments are double - blind
b. blinding subjects to treatments, categorizing subjects by treatment groups, and replicating until results are statistically significant
c. randomizing the assignment of subjects, replicating across multiple subjects, and carefully recording all measurements
d. randomly selecting subjects, ensuring informed consent, and controlling potential sources of confounding
e. controlling for outside variables, randomizing treatment assignments, and replicating with a sufficient sample size

Explanation:

The three basic principles of experimental design are control (manipulating outside variables), randomization (randomly assigning treatments), and replication (using a sufficient sample size). Option E correctly encompasses these principles.

Answer:

E. Controlling for outside variables, randomizing treatment assignments, and replicating with a sufficient sample size