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March 30, 2015

March 30, 2015

Posted by **Susan** on Tuesday, October 12, 2010 at 12:50pm.

A. If you choose one student at random, what is the probability that he is between 69 and 78 inches tall?

B. You measure 25 students. What is the sampling distribution of their average height X (sample mean)?

C. What is the probability that the mean height of your sample is between 69 and 71 inches?

I missed my class, and I'm lost on how to do this.

- Prob and Stats -
**PsyDAG**, Wednesday, October 13, 2010 at 2:27pmA. Z = (score-mean)/SD

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

B. Stand Error of the mean (SEm) = SD/√(n-1)

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

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

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

Use that same table.

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