consider the quality of products as a major factor in their purchasing
decisions, alike, quality control is a major concern to most Corporations.
Quality control is also applied, in back-checking
the sampling distribution of a product promotion. The role of Quality
Control here is to evaluate the success of a sample distribution to consumers.
Quality control for back-checking samples' distribution to
consumers may be broadly defined as those statistical methods that are
used in measuring, controlling and improving quality and success of
sampling promotional campaigns.
Quality control methods measure the variation in the output of the
distribution process. Studying the variation in data helps to analyze
the process, evaluate its effectiveness in producing high-quality,
low-cost output; and adjust as well as improve the process to achieve better