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Probability distribution
a statistical function that describes all the possible values and likelihoods that a random variable can take within a given range.
Combination
If a set consists of n objects, and we wish to form a subset of x objects from these n objects, without regard to the order of the objects in the subset
Nonnegative function
a probability distribution (sometimes called a probability density function) of the continuous random variable X if the total area bounded by its curve and the x -axis is equal to 1 and if the subarea under the curve bounded by the curve, the x -axis, and perpendiculars erected at any two points a and b give the probability that X is between the points a and b.
Sampling distribution
The distribution of all possible values that can be assumed by some statistic, computed from samples of the same size randomly drawn from the same population
Standard error
The square root of the variance of the sampling distribution
Note 
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