Input variables or signal factors are those that can be set at the desired levels by the experimenter.
That is, these variables can be controlled during the experiment and at the design stage and or in the actual production stage.
Experimental runs under identical conditions should be replicated a suffi-cient number of times to obtain accurate estimates of experimental errors and the effects of the input variables on the response variables
American Society for Quality Control
BETA Distribution has four parameters: a and b, which are, respectively, the minimum and maximum values that a beta random variable can assume, and g and h, which are the shape parameters.
The beta distribution is a more flexible probability density function compared to the normal distribution because it can accommodate different ranges (not always from α to + α , as in the normal distribution) and different shapes from left skew
The Basic forms of variation are Assignable variations and Coomon Variations
In Process Improvement, we define the customer as the next person in line whoever receives the output or value of the product or service.
It process the output to the customer service by the agent regarding the product or output of the severices.
Quality Center has the same functions as test-director it is the difference of the Lay-out or appearence can also be called as cosmetic difference
T.D:- Test cases to be written on word/excel
Q.C :- directly write test cases
Quality Center is the updated version of a Test Director, with more speed.There is not much of a difference between test-director and quality center
product quality means we concentrate always final quality but in case of process quality we set the process parameter