Dr. Shang is studying the effects of caffeine on hunger. He hypothesizes that people who ingest more caffeine experience less hunger pangs throughout the day. He designs a study where one group of participants is given caffeine throughout the day, and the other group is not allowed to have any caffeine. He then has the two groups journal their hunger pangs throughout the day and he compares the results. Inthis study, the dependent variable is:
A) the number of hunger pangs a participant experiences.
B) the amount of caffeine a person ingests.
C) the time of day when the hunger pangs happen.
D) the age of the participant.
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