Two Independent Groups When we use random assignment in an experiment, we guarantee that
A)every subject in our sample has an equal chance of being placed in any of the treatment conditions.
B)every subject in the population has an equal chance of being selected for the experiment.
C)the treatment groups are identical on potentially confounding extraneous variables.
D)treatment order is randomized to prevent order effects.

Question

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Random assignment ensures that every subject has an equal chance of being placed in any of the treatment conditions. This means that the treatment groups are likely to be similar on potentially confounding extraneous variables, making it possible to attribute any observed differences between the groups to the manipulation of the independent variable.

Two Independent Groups When We Use Random Assignment in an Experiment