Statistics design of experiment -testing of the null hypothesis by ClassOf1

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									              Sub: Statistics                                                          Topic: Design Of Experiment



              Question:
              Give the hypothesis and test whether to reject the null hypothesis.

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              Students in a business research methods course performed a completely randomized design to test the
              strength of four brands of trash bags. Weights were placed into a bag one at a time until the bag broke.
              The number of pounds required to break the bag was recorded. A total of 40 bags were tested. The data
              in the attached file, “TRASHBAGS” gives the weight (in pounds) required to break all 40 of the trash
              bags.*


              a.        Accurately state the null hypothesis to be tested in this business problem.


              b.        Accurately state the research hypothesis to be tested in this business problem.


              c.        At the 0.05 level of significance, is there evidence enough to reject the null hypothesis in this
              case? If you believe there is evidence, review that evidence, to prove your point. If you believe there is
              not enough evidence, explain why not.



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