An independent-measures study uses two samples, each with n = 20. What are the d

Question

An independent-measures study uses two samples, each with n = 20. What are the df for this study? 9 10 38 40 The data from an independent-measures research study produce a sample mean difference of 4 points and a pooled variance of 16. If there are n = 8 scores in each sample, then what is the estimated standard error for the sample mean difference? 20 4 16 2 An independent-measures study with n = 15 in each sample. produces a sample mean difference of 5 points and a pooled variance of 10. What is the value for the t statistic? 3.54 -4.31 -354 4.31

Explanation / Answer

16) degree of freedom =n1+n2-2 =20+20-2 =38

17)estimated std error =(16(1/8+1/8))1/2 =2

18) estimated std error =(10(1/15+1/15))1/2 =1.1547

test stat =sample mean difference/std error =5/1.1547 =4.31

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