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Posted by **fredia** on Wednesday, February 9, 2011 at 9:12pm.

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A. Give calculated score and critical score.

B. Do the psychologists data differ significantly from what the family therapist stated?

C. Is the family therapists claim an overestimate or an underestimate of actual time spent talking to children, compared to the sample size.

- statistics -
**PsyDAG**, Thursday, February 10, 2011 at 9:02amCalculate mean and standard deviation (SD) for your sample.

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 that Z score.

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