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April 18, 2015

April 18, 2015

Posted by **Vanessa** on Tuesday, April 15, 2014 at 10:02pm.

Assume that the population standard deviation on each part of the test is = 100.

a. What is the probability a sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test (to 4 decimals)?

b. What is the probability a sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 515 on the Mathematics part of the test (to 4 decimals)?

c. What is the probability a sample of 100 test takers will provide a sample mean test score within 10 of the population mean of 494 on the writing part of the test (to 4 decimals)?

- statistics -
**PsyDAG**, Wednesday, April 16, 2014 at 2:12pmSEm = SD/√n

10 = ± Z (SEm)

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.

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