A company has started a six sigma project. The goal is to reduce the defects to zero. They have just done the first initiative and have data collected for comparison to the defect rate before the process improvement to check if the average number of defects has gone down. What is the null hypothesis?

A company has started a six sigma project. The goal is to reduce the defects to zero. They have just done the first initiative and have data collected for comparison to the defect rate before the process improvement to check if the average number of defects has gone down. What is the null hypothesis?

μ₁: average number of defects before the process improvement

μ₂: average number of defects after the process improvement