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January 31, 2015

January 31, 2015

Posted by **Barbara** on Monday, November 15, 2010 at 5:34pm.

- Statistics -
**MathGuru**, Monday, November 15, 2010 at 9:59pmHere are a few hints:

1. Use a one-sample z-test for both A and B, which is:

z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size)

2. Find the critical or cutoff value to reject the null using a z-table for .05 level of significance for a two-tailed test. If the test statistic exceeds the critical value you find in the table, reject the null and conclude a difference. If the test statistic does not exceed the critical value you find in the table, do not reject the null. You cannot conclude a difference in this case.

I hope this will help get you started.

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