Islamic University of Gaza

Faculty of Engineering

Industrial Engineering Department

EIND4022: Statistical Quality Control “Discussion”

Home work #5

Due date 5/1/2010

Question#1 Breeze Toothpaste Company has been having a problem with some of the tubes of toothpaste leaking. The tubes are packed in containers with 100 tubes each. Ten containers of toothpaste have been sampled. The following numbers of toothpaste tubes were found to have leaks:

Develop a p-chart with three-sigma control limits and evaluate whether the process is in statistical control (Draw by hand)

Question#2

Solve problem #6.2

Question#3

Hospitals and their on-site pharmacies are very careful about expiration dates on the thousands of drugs they administer. The following data provide information about the past 12 months of defective product. Calculate the control limits and centerline for an np chart.

Sample size Defectives

1000 3

1000 2

1000 4

1000 2 1000 3

1000 8

1000 10

1000 11

1000 10

1000 9

1000 12

1000 10

Question#3

Solve problem # 6.4 (It is not necessary to draw, it will be enough to compute the limits)

Note: It is not necessary to type the homework.