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November 21, 2014

November 21, 2014

Posted by **Terra** on Tuesday, November 17, 2009 at 11:48pm.

Identify one or two-tailed

States the Null and Alternative Hypothesis

States the Level of Significance

Calculates Test Statistic

Formulates Decision Rule

Makes a Conclusion

- Statistics -
**MathGuru**, Thursday, November 19, 2009 at 12:10pmNull hypothesis:

Ho: µ = 83 -->meaning: population mean is equal to 83

Ha: µ does not equal 83 -->meaning: population does not equal 83

Since the problem is using confidence intervals, remember that 5% (or .05) will be below the interval and 5% (or .05) will be above the interval. This will be a two-tailed test.

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 = (89 - 83)/(3.5/√21)

Finish the calculation.

Determine whether or not to reject the null. If you reject the null, you will conclude a difference.

I hope this will help get you started.

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