MAT510 Homework Assignment 7 (2016-06-02).docx

MAT510 Homework Assignment 7 (2016-06-02).docx - MAT 510...

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MAT 510 – Homework Assignment Homework Assignment 7 Due in Week 8 and worth 30 points The experiment data in below table was to evaluate the effects of three variables on invoice errors for a company. Invoice errors had been a major contributor to lengthening the time that customers took to pay their invoices and increasing the accounts receivables for a major chemical company. It was conjectured that the errors might be due to the size of the customer (larger customers have more complex orders), the customer location (foreign orders are more complicated), and the type of product. A subset of the data is summarized in the following Table. Table: Invoice Experiment Error Customer Size Customer Location Product Type Number of Errors - - - 15 + - - 18 - + - 6 + + - 2 - - + 19 + - + 23 - + + 16 + + + 21 Customer Size: Small (-), Large (+) Customer Location: Foreign (-), Domestic (+) Product Type: Commodity (-), Specialty (+) Reference: Moen, Nolan, and Provost (R. D. Moen, T. W. Nolan and L. P. Provost. Improving Quality through Planned Experimentation . New York: McGraw-Hill, 1991)
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