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    Confidence Interval for Mean: Chris Cross Manufacturing

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    Tesla Motors needs to buy axles for their new car. They are considering using Chris Cross Manufacturing as a vendor. Tesla's requirement is that 95% of the axles are 100 cm ± 2 cm. The following data is MegaStat output from a test run from Chris Cross Manufacturing.

    Should Tesla select them as a vendor?

    Explain your answer.

    Descriptive statistics:

    count 16

    mean 99.938

    sample variance 2.313

    sample standard deviation 1.521

    minimum 97

    maximum 102.9

    range 5.9

    population variance 2.169

    population standard deviation 1.473

    standard error of the mean 0.380

    Tolerance interval 95.45% lower 96.896

    Tolerance interval 95.45% upper 102.979

    half-width 3.042

    1st quartile 98.900

    median 99.850

    3rd quartile 100.475

    interquartile range 1.575

    mode 98.900

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    Solution Summary

    The solution provides step by step method for the calculation of confidence interval for population mean. Formula for the calculation and Interpretations of the results are also included.