Question

A process having a standard deviation of 0.09 needs to satisfy a specification having 4.5 and 3.5 upper and lower limits. The process is ____ .

		Potentially capable if centered
		Not capable even if centered
		Centered
		Marginally capable if centered

Answer 1

Solution:

Given in the question

Upper specification limit (USL) =  4.5

Lower specification limit (LSL) = 3.5

Process Standard deviation() = 0.09

Process capability index can be calculated as

Process capability index = (USL- LSL)/6* = (4.5-3.5)/6*0.09 = 1.85

If process capability index is less than 1 that means process is not capable

If process capability index is greater than 1 that means process is capable.

So its answer is A. I.e. process is potential capable if centered