Essentials of Statistics for the Behavioral Sciences by Gravetter Frederick J. & Wallnau Larry B

Author:Gravetter, Frederick J. & Wallnau, Larry B. [Wallnau, Larry B.]
Language: eng
Format: epub
Tags: Textbook
Publisher: Wadsworth
Published: 2010-09-30T06:00:00+00:00

FIGURE 10.6

Two sample distributions representing two different treatments. These data show exactly the same mean difference as the scores in Figure 10.5; however, the variance has been greatly increased. With the increased variance, there is no longer a significant difference between treatments, t(16) = 1.59, p > .05, and both measures of effect size are substantially reduced, d = 0.75 and r2 = 0.14.

10.4 ASSUMPTIONS UNDERLYING THE INDEPENDENT-MEASURES FORMULA

There are three assumptions that should be satisfied before you use the independent-measures t formula for hypothesis testing:

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