The purpose of control charts is to: no answer selected a - estimate the proportion of output that is acceptable b - weed out defective items c - determine if the output is within tolerance/specifications d - distinguish between random variation and assignable variation in the process e - none of the above

D) distinguish between random variation and assignable variation in the process

Explanation:

The purpose of control charts is to help distinguish between natural/random variations and assignable variations (variations that have an specific cause) in the Statistical Process Control. Using a control chart can help to monitor process variables and detect any variations. The real objective of elaborating control charts is to detect what can be the cause of assignable variations.

d) social security number

let me know if i am correct or not, so i can edit the answer.

credit history is used by lenders to determine whether you are a 'risky' person to give their money to.

having a short history provide very little data for the lenders. they wouldn't be able to determine your credit behavior from such a small samples. even if they are perfect.

having long credit history with few blemishes provide larger and more accurate data for the lenders to predict your credit behavior.