Posted by **jc** on Sunday, June 27, 2010 at 4:16pm.

a random sample of 100 college students is taken from the student body of a large university. assume that a population mean of 20 hours and a population standard deviation of 15 hours describes the weekly study estimates for the entire student body. About 68 percent of the sample means in this sampling distribution should be between?

- statistics -
**PsyDAG**, Monday, June 28, 2010 at 10:57am
68% are approximately within mean ± 1 SD

Z = ±1 = (score - mean)/SEm

SEm = SD/√(n-1) = approx. SD/10

Insert values in above Z equation to get scores.

- statistics -
**Tempie**, Monday, June 28, 2010 at 3:29pm
consider a normal distribution with mean 27 and standard deviation 6. What is the probability a value selected at random from this distribution is great than 27?

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