T-Test of a Mean

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Where \bar x is the observed mean, e is the expected value, s is the sample standard deviation, n is the sample size, and d_{eff} is Extra deff:

 t = \sqrt{n/d_{eff}}\frac{\bar x - e}{s}

where p = 2 \Pr(t_{n-1} \ge |t|) if \bar x \ne e and NaN otherwise. .

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