<em>The population in this study is the entire students at UH </em>
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Step-by-step explanation:
<em>A population is a set of events or items of interest for the experiment or research</em>. Since she wishes to determine the average amount of money a student of UH spend on lunch, then<em> the population the researcher wishes to make this decision from is the entire students at this school.</em>
<em>The first 100 students leaving the student center after 12:00 is a subset of the entire population, which means this first 100 students are the sample she wishes to draw from the entire population of students at UH</em>. This sample was probably chosen for some reason best known to the researcher and the nature of his/her research.