Privitera, G. J. (2017). Student Study Guide With IBM® SPSS® Workbook for Statis
Privitera, G. J. (2017). Student Study Guide With IBM® SPSS® Workbook for Statistics for the Behavioral Sciences, 3rd Edition. ISBN: 9781506389929 Exercise 9.1 and 9.2 pages 179-182.
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