<em>Take into account that a population data set contains all members of the group and a sample data set contains only a subpart of the group.</em>
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<em>In this case, Ms. Smith can take the scores of all students of the math class, due to this group is not enough big to consider to take a subpart.</em>
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<u><em>Hence, Ms. Smith should consider her data as a population data set.</em></u>