This table gives a probability that a statistic is less than Z (i.e. Values in the table represent areas under the curve to the left of Z quantiles along the margins. The higher the degrees of freedom, the closer that distribution will resemble a standard normal distribution with a mean of 0, and a standard deviation of 1. Note that for z = 1, 2, 3, one obtains (after multiplying by 2 to account for the interval) the results f( z) = 0.6827, 0.9545, 0.9974, T-Distribution table refers to a type of probability distribution that is theoretical and resembles a normal distribution. If X is a random variable from a normal distribution with mean μ and standard deviation σ, its Z-score may be calculated from X by subtracting μ and dividing by the standard deviation:
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