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January 28, 2015

January 28, 2015

Posted by **lauren** on Saturday, February 16, 2008 at 5:16pm.

- statistics -
**drwls**, Saturday, February 16, 2008 at 6:21pmThe standard deviation of n-sample means is sigma/sqrt(n). In your case sigma = 9 for the single-sample distribution and the 1.5 for the groups of n. Therefore

1.5 = 9/sqrt(n)

sqrt n = 9/1.5 = 6 and n = 36

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