In an attempt to determine whether noise interferes with performance, Marc randomly assigns participants to take a math test either while listening to loud music or in silence. In this study, the presence of absence of noise would be considered the:
a. independent variable
b. subject variable
c. dependent variable
d. random variable
Question 2
Which of the following statements about random assignment is NOT true:
a. Random assignment is important for inferring cause and effect.
b. Random assignment ensures that participants have an equal chance of being assigned to any group in the experiment.
c. Random assignment is most relevant for ensuring external validity.
d. Random assignment ensures that each group contains the same type of participants.
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