1. An independent-measures study produces sample means of M 1 = 35 and M 2 = 31

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Question

1. An independent-measures study produces sample means of

M1 = 35 and M2 = 31 and a pooled variance of 25.

For this study, Cohen’s d = ____.

A sample of n = 16 scores produces a t statistic of t = 2.00.

If the sample is used to measure effect size with 2,

what value will be obtained for 2?

The data from an independent-measures research study

produce a sample mean difference of 6 points,

and an estimated standard error of 2 points.

If there are n = 8 scores in each sample,

then the value for the t statistic is ____.

A repeated-measures study comparing two treatments,

with a sample of n = 4 participants,

a mean difference of M = 4 and a variance of 4 for the difference scores.

What is the estimated standard error for the sample mean difference?

1. Cohen's d = M1-M2 /sd = 35-31/25 =0.16;

2.cohen's d =1.0328; effect size = 0.45883

3. t =6/2 =3 ; df =7

4. estimated standar error = sd /sqrt(n) =2/ sqrt(4) = 1

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