The object of a statistical process control (SPC) system is to

Select one:

a. Provide a signal when assignable variations are present.

b. Assess the customer expectations

c. Eliminate natural variation.

d. Provide a signal when natural variations are present.

Twenty samples of size 5 are taken from a stable process. The average means of the sample means is 42.5, and the average range of the sample is 1.5. What is the UCL for the x-bar chart?

Select one:

a. 47

b. 43.37

c. 42.5

d. 3.17

Twenty samples of size 5 are taken from a stable process. The average means of the sample means is 42.5, and the average range of the sample is 1.5. What is the UCL for the R-chart?

Select one:

a. 0

b. 43.37

c. 3.17

d. 1.5

For the last 30 days, the number of mistakes on the daily report has averaged 4.5. What would the UCL be if a 3-sigma c-chart was constructed?

Select one:

a. 10.86

b. 2.12

c. 7.5

d. 18

A bottling company runs a filling process that should fill bottles with 12 plus or minus 0.04 ounces. A capability study reveals that the process mean is 12 ounces and the standard deviation is 0.01 ounces. What is the capability of the bottling process?

Select one:

a. 1.5

b. 0.67

c. 0.75

d. 1.33