Posted by **Pat** on Monday, June 25, 2012 at 9:13pm.

A study was conducted in order to estimate u, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults give a mean weekly computer usage time of 8.5 hours and that from prior studies , the population standard deviation is assumed to be 3.6 hours.

- Statistics -
**PsyDAG**, Tuesday, June 26, 2012 at 10:52am
Are you looking for the confidence interval?

What level of significance are you using?

95% = mean ± 1.96 SEm

SEm = SD/√n

- Statistics psychology -
**cnm**, Monday, July 7, 2014 at 12:46pm
n a planned study, there is a known population with a normal disrubution, \mu= 0, and \sigma=10. What is the predicted effect size (d) if the researchers predict that those given an experimental treatment have a mean of (a) -8, (b) -5, (c) -2, (d) 0, and (e) 10 ? For each part, also indicate wether the effect is approximatley small, medium, or large.

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