All simulators
Statistical Power Visualiser
The null and alternative sampling distributions, the rejection region, α, β and power.
Day 10: Hypothesis Testing, p-Values & PowerH₀: τ = 0H₁: true effect τ
Power
51.6%
β = 48.4%
Standard error
1.000
σ√(2/n)
MDE at 80% power
2.80
2.80 × SE
n per arm for 80%
393
Blue: where the estimate lands if there is no effect. Orange: where it lands if the effect is τ. Shaded orange = power; shaded blue tails = α; the hatched part of the orange curve inside the critical values = β.