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April 20, 2014

April 20, 2014

Posted by **Amy** on Wednesday, April 4, 2012 at 4:38pm.

- Statistics -
**MathGuru**, Wednesday, April 4, 2012 at 8:19pmTry a one-sample z-test.

Hypotheses:

Ho: µ = 40 -->null hypothesis

Ha: µ > 40 -->alternate hypothesis

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

With your data:

z = (43.5 - 40)/(8/√100) = ?

Finish the calculation.

Check a z-table at level 0.05 for a one-tailed test.

If the z-test statistic exceeds that value from the z-table, reject the null and conclude µ > 40. If the z-test statistic does not exceed the that value from the z-table, do not reject the null (you cannot conclude a difference).

I hope this will help get you started.

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