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 Racker and Stoeckenius experiment showing that an H+ electrochemical gradient drives ATP synthes
The Hershey-Chase Experiment
a) Avoid locking your elbows. b) To avoid locking your elbows, keep your elbows facing sideways.
A black impact socket. Always use an impact-type socket whenever using an impact wrench to avoid ...
Example of pre- and posttest Interpretation in an Experiment
Skin color is a polygenic trait controlled by three or four genes, producing a wide range of phenoty