What does the six sigma performance measurement involve?

The concept of six sigma performance measurement fundamentally revolves around understanding and reducing variation in processes to improve quality and efficiency. This is primarily achieved through the application of statistical methods, making average and variation computation critical components of the six sigma methodology.

In this context, average refers to the central tendency of process performance, while variation measures the degree to which performance deviates from the average. By focusing on these aspects, organizations can identify defects and sources of errors, facilitating data-driven decision making that leads to process improvements. This is why average and variation computation aligns closely with the goals of six sigma, which aims for a defect rate of fewer than 3.4 defects per million opportunities.

The other choices, while they touch on aspects of performance measurement, do not encapsulate the primary focus of six sigma. Statistics, while relevant, is not the comprehensive framework of the goal as depicted in the correct answer. Cost reduction and satisfaction, as well as time management and affordability, are elements that can be influenced by six sigma but do not capture the methodological essence of measuring performance through statistical averages and variations directly.