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September 2, 2014

September 2, 2014

Posted by **Janice** on Wednesday, February 10, 2010 at 5:54pm.

- Statistics -
**MathGuru**, Monday, February 22, 2010 at 8:32pmHo: µ = 40 -->population mean = 40

Ha: µ < 40 -->population mean < 40

Using a one-sample z-test:

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

With your data:

z = (39 - 40)/(8/√100)

Finish the calculation. Determine whether or not to reject the null using 0.05 level of significance for a one-tailed test.

I hope this will help.

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