For a repeated-measures study comparing two treatment conditions, a researcher obtains a sample of n = 9 difference scores with a mean of MD = 4 and a variance of s2 = 36. What is the value for the repeated-measures t statistic for these data?     a.  ​4/2   b.  ​4/4   c.  ​4/6   d.  ​4/36

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