A major disadvantage of between-subjects designs is that
a. the effect of one treatment may alter the effectiveness of later treatments.
b. participant differences may obscure treatment effects.
c. one must employ fewer independent variables.
d. one can use only a single independent variable.
Question 2
Preventing an extraneous variable from becoming a confounding variable by holding it constant can result in a threat to external validity.
a. True
b. False
Indicate whether the statement is true or false
Inhibition and facilitation of spruce during the major successional stages at Glacier Bay, Alaska (d
Major Impacts on Mercury and on Our Moon
The Placebo Effect
Alzheimer’s Drugs Work by Intensifying the Effect of Acetylcholine at the Receptor
Comparison of the two major forms of DNA
Phantom Limb Treatment