Power Function μ↦G(μ):=Pμ( reject H0)(μ∈H0∪H1)\mu \mapsto G(\mu):=\mathbb{P}_{\mu}\left(\text { reject } H_{0}\right) \quad\left(\mu \in H_{0} \cup H_{1}\right)μ↦G(μ):=Pμ( reject H0)(μ∈H0∪H1) Probability that H0H_0H0 gets rejected based on some unknown μ\muμ. α(μ)\alpha(\mu)α(μ) is probability of Type 1 Error for μ\muμ β(μ)\beta(\mu)β(μ) is probability of Type 2 Error for μ\muμ Power of the test: 1−β(μ)1-\beta(\mu)1−β(μ)