A researcher wants to know how undergraduate college students at her university feel about a list of 1196 undergraduate college students at her university, selects 500 of them at random, and emails a questionnaire to them 107 questionnaires are returned. Of these, 71% stated that they believe that the federal student loan program needs to be completely overhauled. Classify the following groups as the population or the sample for this particular study. If a group does not belong in either category, leave it unplaced. federal financial aid. She obtains Population Sample all u the 1196 u the proportion of all undergraduate college students at the researcher's university who believe that the federal student loan program needs to be completely overhauled the 71% who stated that the federal student loan program needs to be completely overhauled the 107 undergraduate college students who returned the questionnaire all undergraduate college studentst