Which of the following is the primary goal for randomizing an extraneous variable in an experiment? a. increase the ability to generalize the results b. avoid selection bias c. ensure that the...

Which of the following is the primary goal for randomizing an extraneous variable in an experiment?

a. increase the ability to generalize the results

b. avoid selection bias

c. ensure that the variable in the sample is representative of the variable in the population

d. minimize the likelihood that the variable is confounding