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    Forecasting: Regression analysis for defective parts

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    The supervisor of a manufacturing process believes that assembly line speed (in feet/minute) affected the number of defective parts found during online inspection. To test this theory, management had the same batch of parts inspected visually at a variety of line speeds. The following data were collected.

    Line Speed Number of Defective Parts Found
    20 21
    20 19
    40 15
    30 16
    60 14
    40 17

    Develop the estimated regression equation that relates line speed to the number of defective parts found.

    Use the equation developed above to forecast the number of defective parts found for a line speed of 50 feet per minute.

    Compute b1, compute b1 and draw the graph.

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    Solution Summary

    This solution provides steps necessary to compute the required equations.