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Unformatted text preview: significant difference in the data, the hypothesis must be rejected. Researchers use samples instead of populations because a sample is a small group of member of a population that has been selected to represent the population. The samples must be random in order to learn things about the population because it allows each member of the population an equal chance to be selected. 3 References Bluman, A. G. (2010). Elementary Statistics A Brief Version, 5th Edition. New York, NY: McGraw-Hill. Gaten, T. (2000, May). Z-tests and t tests . Retrieved February 28, 2010, from University of Leicester: http://www.le.ac.uk/bl/gat/virtualfc/Stats/ttest.html Thirtle, M. (2010, February 22). Week 3 Chat. AIU Live Chat . Hoffman Estates, IL, USA: American InterContinental University....
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- Spring '10
- Statistics, American Intercontinental University, extrinsic mean value, intrinsic mean value