Question

Judy Holmes Industries has decided to use a p-Chart to monitor the proportion of defective castings produced by their production process. The control limits on these charts will be designed to include 95%95% of the sample proportions when the process is In Control. The operations manager randomly samples 400400 castings at 1616 successively selected time periods and counts the number of defective castings in the sample.

Table

Control Chart

Copy Table

Step 8 of 8 :  

You, acting as the operations manager, have concluded that the process is "Out of Control". What is the probability that the process is really "In Control" and you have made a Type I Error? Round your answer to three decimal places.

Sample   Defects
1   10
2   11
3   8
4   11
5   8
6   11
7   7
8   14
9   9
10   14
11   10
12   9
13   12
14   7
15   7
16   10

Answer 1

sample14 ornofe h 400 0,395 Center line p 0,395