Answer, Opinion module 5.2

In both John and Mark’s studies, the null hypothesis would claim that the self-esteem among victims of domestic violence would not change after completing an 8-week program.  Both would use the alternative, one-tailed, directional hypothesis to state that the self-esteem of the domestic abuse victims would be higher after attending the program. Since John calculated t=1.9 after his study, he would reject his null hypothesis claiming a statistically significant difference in self-esteem levels after the 8-week program.  Mark also calculated a t=1.9 showing the same claim as John regarding the statistically different level of self –esteem.  While Gravetter and Wallnau (2010) claim that logically a larger sample would have better representation than a smaller sample, an observation can be made that even though John only used 10 individuals and Mark used 100 both provided data that was outside the critical levels.  In this instance, the sample size did not make a difference.

Maureen

Gravetter, F. J. & Wallnau, L. B. (2010). Statistics for the behavioral sciences (9th ed.). Belmont, CA: Wadsworth Cengage Learning.

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