To avoid bias and confounds in a controlled experiment, participants should be assigned to either the experimental or control group ____.
a. on the basis of careful thought
b. randomly
c. on the basis of individual tests
d. according to age variables
Question 2
Derrill is worried that variables such as age, gender, personality characteristics, and education level might confound the results of his experiment, which is designed to test the effects of mood on reaction time. Derrill should use ____ assignment to experimental groups to distribute the impact of these ____ variables.
a. random; representative
b. representative; random
c. representative; representative
d. random; random
The Meselson-Stahl Experiment
Avoid hyperextending the pelvis.
a) Shift your weight at the end of your reach. b) Avoid overreaching.
A participant in a sleep experiment.
Anterior and posterior triangles of the neck. Avoid massage in anterior neck.
Compression using reinforced palm. The heel of the top hand is placed to avoid putting pressure on ...