b) UCLp =

LCLp =

c)

The process has been in control when ratio of defects is within the limits.

Based on the developed control limits, the number of incorrect bills processed has been ( )

d)

To reduce the error rate, which of the following techniques can be utilized:

A.

Fish-Bone Chart

B.

Brainstorming

C.

Pareto Chart

D.

All of the above

The accounts receivable department at Rick Wing Manufacturing has been having difficulty getting customers to pay the full amount of their bills. Many customers complain that the bills are not correct and do not reflect the materials that arrived at their receiving docks. The department has decided to implement SPC in its billing process. To set up control charts, 10 samples of 50 bills each were taken over a month's time and the items on the bills checked against the bill of lading sent by the company's shipping department to determine the number of bills that were not correct. The results were: 1 2 3 4 5 6 7 8 9 10 Sample No. No. of Incorrect Bills 7 5 16 4 0 5 3 6 9 2 (enter your response as a fraction between 0 and 1, rounded to four a) The value of mean fraction defective (p) decimal places)