A simple extension of the estimation of a binomial proportion p is the estimation of the difference between two binomial proportions 
and 
.
Definitions:
Quality of Product
The degree to which a product meets the specified criteria and satisfies the customer's expectations.
Sigma
A statistical term that measures how far a given process deviates from perfection. The term is notably used in Six Sigma methodology to measure the number of defects in a process.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values from the mean.
Benchmarking
The process of comparing key points within your business with comparable points in another external entity.
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