Question

Jeff and susan were participants in a research study examining the influence of stimulants on memorization abilities. Jeff was given coffee that had caffeine in it while susan was given decaffeinated coffee. They each had to memorize a list of words. Jeff:

Answer 1

Then they each had to memorize a list of words. Jeff  "was placed in the experimental group".

In an experiment, information from an experimental group is contrasted and information from a control group.  

group is the gathering that gets a test strategy or a test.  

This group is presented to changes in the independent variable being tried. The estimations of the independent factor and the outcome on the dependent variable are recorded. An examination may incorporate various experimental groups at one time.