Chapter 13. Testing for Statistically Significant Change Using Proportional Data
What you will learn in this chapter is to use limited samples on proportional data. This chapter will parallel the last chapter, in which we learned to use limited samples on variables data. Valid sampling and analysis of proportional data may be needed in all steps in the DMAIC process.
NOTE
Changes in Real Processes, Proportional Data
Manufacturing Use samples of scrap parts to calculate proportions on shifts or similar production lines. Look for statistically significant differences in scrap rate.
Sales Sample and compare proportions of successful sales by different salespeople.
Marketing Use polls to prioritize where advertising dollars should be spent.
Accounting ...
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