e r squared
1. Two samples, each with an n = 9 scores, produce an independent measures t of t = +2.00. If the effect size is measured using r squared, what is the value r squared?
2. An independent samples t-test research study uses a total of 40 participants to compare two treatment conditions. What is the df value for the t statistic for this study?
3. A researcher predicts that scores in treatment A will be higher than scores in treatment B. This is a 2-tailed test.
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Two samples, each with an n = 9 scores, produce an independent measures t of t = +2.00.
If the effect size is measured using r squared.
The value r-squared is =
where t is the value of t statistic and
df is the degrees of freedom,n-1
=9-1
=8
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