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March 26, 2015

March 26, 2015

Posted by **LT** on Monday, October 29, 2007 at 11:05pm.

- Statictics -
**MathGuru**, Tuesday, October 30, 2007 at 7:59amLet's set up a null and alternative hypothesis, find a formula, then go from there.

Null hypothesis:

Ho: µ = 20.5 -->meaning: population mean is equal to 20.5

Ha: µ < 20.5 -->meaning: population mean is less than 20.5

Using the z-test formula to find the test statistic:

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

z = (19.5 - 20.5)/(2.3/√30)

Calculate the z-test statistic and draw your conclusions. Remember if the null is not rejected, there is no difference. If the null is rejected, there is a difference.

I hope this will help.

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