"less frequently" is the research hypothesis which was confirmed by the data as this statement is written. The study has been done and this is the result.

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Hypertext tutorial to teach social science experimental design by Don R. Osborn is licensed under a Creative Commons Attribution 3.0 United States License.
Based on a work at cas.bellarmine.edu.
Permissions beyond the scope of this license may be available at drosborn@bellarmine.edu.