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Social Studies, 01.08.2019 03:00 suicune19

Professor lyon decided to study food preferences of u. s. college students, so he asked his students to volunteer to participate in a lengthy survey. professor lyon's survey results are probably invalid because he did not use: an operational definition. random selection. a valid hypothesis. independent and dependent variables.

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Professor lyon decided to study food preferences of u. s. college students, so he asked his students...
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