1. Choose the correct statement(s) regarding variation due to assignable causes in statistical process control (SPC).

a.

When one is baking cookies, changing the flour used can result in a change of it taste. In that case changing the flour would be an assignable cause

b.

A process under statistical control can have variation due to assignable causes.

c.

Poorly trained worker is an example of an assignable cause.

d.

Variation that is not inherent in the process is variation due to assignable causes.

2.The quality manager is assessing the capability of a process that puts pressurized grease in an aerosol can. The design specifications call for an average of 60 pounds per square inch (psi) of pressure in each can with an upper specification limit of 65 psi and a lower specification limit of 55 psi. The process has recently been in a state of statistical control with mean 61 psi and standard deviation of 1 psi. What is the capability of the process (Cpk)?

3.The quality manager is assessing the capability of a process that puts pressurized grease in an aerosol can. The design specifications call for an average of 60 pounds per square inch (psi) of pressure in each can with an upper specification limit of 65 psi and a lower specification limit of 55 psi. The process has recently been in a state of statistical control with mean 61 psi and standard deviation of 1 psi. What is the probability of producing a defect (assume pressure is normally distributed) WRITE YOUR ANSWER WITH 3 SIGNIFICANT DIGITS?

4.Choose the correct statement(s) regarding a Cpk value of 1.25 in statistical quality control.

a.

Probability of producing defectives would be larger for a process with Cpk=1

b.

The process cannot be centered

c.

Process cannot be in statistical control

d.

Process is producing too many (unacceptable) defective products