EWMA chart: small drift
60 observations: mean stays at μ=10 for the first 30 points, then shifts to μ=10.1 (≈ 1σ). EWMA with λ=0.2 detects the drift; a Shewhart I-chart misses it.
60 observations: mean stays at μ=10 for the first 30 points, then shifts to μ=10.1 (≈ 1σ). EWMA with λ=0.2 detects the drift; a Shewhart I-chart misses it.