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    Test a hypothesis

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    Officials want to test whether drivers are obeying the posted speed limit of 65 mph.
    Sample: 55 vehicles.
    Average speed of sample: 69 miles
    Standard deviation: 7 miles
    95% confidence level desired.
    Test the hypothesis that mean speed is less than or equal to 65 mph against its one-sided alternative.

    Please see the attachment.

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    Solution Preview


    Null hypothesis H0: mu<=65
    Alternative hypothesis Ha: mu>65.

    Use z-test. The sample mean ...

    Solution Summary

    This solution consists of a detailed explanation of testing a hypothesis using the so-called five-step procedure.