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
Hershey and Chase experiment showing that the genetic material of T2 phage is DNA
Noll's DNase-I digestion experiment, which verified the beads-on-a-string model of DNA compacti
The Meselson-Stahl Experiment p1
a) Face the direction of your stroke. b) Avoid facing away from your stroke.
Normal combustion is a smooth, controlled burning of the air–fuel mixture.
The Meselson–Weigle experiment