Hey everyone, welcome to this lecture, what is an NP chart an NP chart is used when you are capturing defectives. And when the subgroup size is the same. The statistical principle underlying this chart is based on the binomial distribution. binomial means to any situation can have two outcomes, either pass or fail defective or non defective etc. and NP chart tracks the number of defectives and detects the presence of special causes. Let's look at this example.

The given data provides the number of defective assemblies in sample of size hundred identify if the process is in control. In this example, you are capturing defectives and the sample size is constant. This you will use an NP chart so, how to construct this NP chart. Let's learn that in the next lecture.