Monthly volume
Relationships
Spread by group
Trend + forecast
R² = 0.91
Correlation
Utilisation
72%
38%
Cumulative cost
Distribution
μ
Cost vs. delay
r = 0.87
y = β₀ + β₁x + ε
σ² = Σ(xᵢ − μ)² / n
p < 0.05
Δ = +12.4%
x̄ = 391.2K
H₀ : μ₁ = μ₂
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