What is the nature of the effects of the factors studied in this experiment?, Invoice Experiment Error, question help

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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

16

+

19

+

4

+

+

2

+

21

+

+

25

+

+

15

+

+

+

20

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)

Use the date in table above and answer the
following questions in the space provided below:

1. 
What
is the nature of the effects of the factors studied in this experiment?

2. 
What
strategy would you use to reduce invoice errors, given the results of this
experiment?

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