Detect variance reduction (1-sample)
After a process improvement, scatter should have dropped from σ₀ = 1.5 to σ₁ = 1.0. One-sided chi-square test, α = 0.05, power = 80 %. Returns the n needed to confirm the improvement statistically.
After a process improvement, scatter should have dropped from σ₀ = 1.5 to σ₁ = 1.0. One-sided chi-square test, α = 0.05, power = 80 %. Returns the n needed to confirm the improvement statistically.