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March 28, 2015

March 28, 2015

Posted by **gina** on Wednesday, December 12, 2012 at 6:59pm.

A. State the null and alternative hypotheses for this test.

B. find the critical value for this test.

C. Calculate the test statistic.

D. Should we reject or fail to reject the null hypothesis?

E.Based on your answer to a-d, what is your conclusion about the cost cutting measures?

- statistics please -
**MathGuru**, Thursday, December 13, 2012 at 5:48pmH0: µ = 80 -->null hypothesis

H1: µ < 80 -->alternative hypothesis

Critical value for a one-tailed test (the alternative hypothesis shows a specific direction) can be found using a z-table at .05 level of significance.

Calculate the test statistic using a one-sample z-test.

With your data:

z = (76 - 80)/(10/√25)

Finish the calculation.

If the test statistic exceeds the critical value from the table, reject the null and conclude µ < 80. If the test statistic does not exceed the critical value from the table, do not reject the null (you cannot conclude a difference in this case).

I hope this will help get you started.

- statistics please -
**gina**, Saturday, December 15, 2012 at 3:45pmyes you did Thank you...!!!!!

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