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March 5, 2015

March 5, 2015

Posted by **Carl** on Wednesday, June 15, 2011 at 12:52pm.

Male Female

27 25

25 29

19 18

10 23

16 20

17 15

15 19

a. What statistical test should be used to analyze the data?

b. Is this a one- or two tailed test?

c. Identify H0 and Ha for this study.

d. Conduct the appropriate analysis. Should H0 be rejected?

- statistics -
**PsyDAG**, Wednesday, June 15, 2011 at 8:58pmHo: mean1 = mean2

Ha: mean1 ≠ mean2

Does that indicate one-tailed or two?

Find the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to your Z score.

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