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March 3, 2015

March 3, 2015

Posted by **Cameron** on Monday, June 3, 2013 at 8:00am.

1. Identify the population mean.

The population mean is 8.

2. Identify the population standard deviation.

The population standard deviation is 2.

3. Suppose a random sample of 15 people over 55 is selected. What is the probability that the sample mean is above 9?

4. Suppose a random sample of 100 people over 55 is selected. What is the probability that the sample mean will be below 7?

- statistics -
**PsyDAG**, Monday, June 3, 2013 at 12:43pm1 & 2 are right.

3. Z = (score-mean)/SEm

SEm = SD/√n

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

4. Use same process.

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