t-fordeling vs. normalfordeling?
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t har tykkere haler (mer spredning). df=n−1df = n-1df=n−1 frihetsgrader. For df>30df > 30df>30: t≈zt \approx zt≈z. For df→∞df \to \inftydf→∞: t→N(0,1)t \to N(0,1)t→N(0,1).
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