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    Hypothesis formation

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    #1
    Use this word example to answer the following questions for question #1. "Joe's repair shop claims that the average repair time is equal to or less then 60 minutes. You wish to test that hypothesis, and take a sample of 64 repair bill, finding the sample mean to be 65 minutes, with a standard deviation of 2 minutes. Using an Alpha of 0.05, you wish to test to see if the average repair time is greater than 60 minutes."

    Please note that Joe makes a claim, that is the hypothesis, but you wish to test the alternative which is that the time is greater than 60 minutes. This is a key concept in understanding hypothesis testing.

    DQ1-a. List the values for:
    U=
    Xbar=
    N=
    S=
    Alpha =
    Is this a two or one tail test, explain

    #1-b. Show the Ho and HA hypothesis statements in symbols. Start with the Ho and Ha as shown and finish them:

    Ho: u=< 60 minutes
    Ha: u > 60 minutes

    Did you get it?

    Complete #1, then complete one more example.

    #2
    Why does a null and alternative hypothesis have to be mutually exclusive?

    #3
    Why do alphas differ among industries? In your industry what alpha do you think would be appropriate? Common alphas are .01, .05. .10

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    https://brainmass.com/business/managerial-statistics/hypothesis-formation-141192

    Solution Preview

    U = 60 minutes
    Xbar = 65 minutes
    N = 64 receipts
    S= 2 minutes
    Alpha = 0.05

    It is a two tailed test because the number of sample is more than 30. According to some sources 30 is 39, but I teach at the 30 level because that is a social science choice. Business often uses the 39.

    1 B. A landscape designer claims to use ...

    Solution Summary

    Answers to four questions based on hypothesis formation and research testing parts.

    $2.19