Graph description: Figure 2. Student's t distribution with 1, 4, and 20 degrees of freedom, with the Standard Normal distribution

Four symmetrical distribution curves, becoming progressively less long tailed and peaked as the degrees of freedom increases.

They become more like the Normal distribution as the degrees of freedom increases. The curve for 20 degrees of freedom looks very like the Standard Normal curve, and is only very slightly wider at the base.

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Last updated: 24 July, 2009.