a) The Older Than Dirt potting soil company uses a machine to fill 500-ounce bags of enriched potting soil with a standard deviation of 4 oz. The industry group has set limits on what can be called a 500-ounce bag: a 500-ounce bag of dirt must weigh at least 486 ounces and not more than 514 ounces. The company wants to operate its process at a minimum process capability of 1.10.

Calculate the C_p, and evaluate the process capability of scenario a) above.

A. 1.167, process not capable of meeting the variability

B. 1.167, process is capable of meeting the variability

C. .987, process not capable of meeting the variability

D. .987, process capable of meeting the variability

b). Suppose that the company is now operating the process with a mean of 504 ounces and a standard deviation (σ) of 4 ounces. Is the company currently capable of meeting the industry group’s specification standards if the company’s minimum C_pk is 1.10?

Calculate the C_pk, and evaluate the process capability of scenario b) above.

A. 0.833, process not capable of meeting the customer’s requirements.

B. 1.50, process is capable of meeting the customer’s requirements.

C. 0.833, process is capable of meeting the customer’s requirements.

D. 1.5, process is not capable of meeting the customer’s requirements.

Considering the two scenarios above, what conclusion can be drawn:

A. variability is acceptable, but the mean is centered.

B. variability is not acceptable, and the mean has drifted to much and needs to be centered.

C. variability is not acceptable, and the mean is centered..

D. variability is acceptable, but the mean has drifted to much and needs to be centered.

E. none of the above