Which of the following statements is wrong?
a. a cause-and-effect diagram is a useful tool for presenting data in an organized fashion, indicating process problems from most to least severe.
b. lean thinking and six sigma quality are both concerned with achieving low cost and high quality throughout the supply chain
c. the primary design objective with lean layouts is to reduce wasted movements of workers, customers, and/or work-in-process.
d. statistical process control (spc) allows firms to compare process performance to desired levels or required standards.
