If a Researcher Wants to Use a Control Group as Well

Multiple Choice

If a researcher wants to use a control group as well as an experimental group, which type of t test is MOST appropriate and why?

A) z test; it is a single-sample, within-groups design
B) paired-samples t test; it is a single-sample, between-groups design
C) independent-samples t test; it is a two-sample, within-groups design
D) independent-samples t test; it is a two-sample, between-groups design