Assignment
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)
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?