CHAPTER 13Testing for Statistically Significant Change Using Proportional Data

What you will learn in this chapter is how to use limited samples of proportional data. This chapter will parallel the last chapter, in which we learned how to use limited samples of variables data. Valid sampling and analysis of proportional data may be needed in all steps in the DMAIC process.

APPLICATIONS: Changes in Real Processes, Proportional Data

Manufacturing. Use samples of scrap parts to calculate proportions on different 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 ...

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