Observations Samples 1 3 4 1 10 10 9 12 11 11 10 13 10 10 10 10 11 10 10 12 10 11 10 10 10 8 12 7 10 11 10 8 13 10 8 10 8 9. 8 12 12 10 10 12 8 12 2. 3. 4.

Explain what might cause a process to be out of control in managing quality ?

Why are most processes not in statistical control whenthey are first sampled for control chart purposes?

6-9. A process that produces computer chips has a mean of .04 defective chip and a standard deviation of .003 chip. The allowable variation is from .03 to .05 defective. (a) Compute the capability index for the process (b) Is the process capable?

In an existing process, we have found that the lower and upper control limits for Xbar chart are 8.09 and 8.59 respectivelyWhereas, the lower and upper control limits for R chart are respectivelyThe following measurements for one sample are taken: 8.05, 14, 8.28 and 9.25 Using Xbar chart only, what we can conclude about the process mean a Process mean is in control Overall process is in control OcProcess mean is out of control dInsufficient information to conclude

In process industry during a daily production run, a total of five (05) samples are collected with four (04) observations within each sample. The sample means (X-bar) are; 14.09, 13.94,16.86, 20.00, and 16.64 respectively. The corresponding ranges are; 9.90, 7.73, 4.41, 7.56, and 3.49 respectively. The lower and upper control limits of the x-bar chart are respectively O a. 11.44, 20.66 O b. 11.29, 20.65 C. None is correct Od. 11.47, 21.14 e. 11.47, 16.55