Selection biases are LEAST likely to be a problem when
A) researchers randomly assign participants to conditions of the independent variable.
B) researchers randomly assign one pre-existing group (such as children in classroom A) to be their experimental group and those in another pre-existing group (such as children in classroom B) to be their control group.
C) research participants are allowed to choose whether they want to be in the experimental group or the control group.
D) volunteer participants serve as members of the experimental group while non-volunteers from the same population serve as members of the control group.

Question

Quizplus · Accepted Answer

Randomly assigning participants to conditions of the independent variable is the best way to avoid selection biases. This ensures that each participant has an equal chance of being in any group, which reduces the likelihood of any participant characteristics biasing the results.

Selection Biases Are LEAST Likely to Be a Problem When