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The video tutorial discusses parameter estimation, focusing on complete statistics. A statistic t is defined as a function of data following a distribution, with the parameter theta in the parameter space omega. A statistic t is complete for a family of distributions if the expected value of every function of t equals zero implies that the function is zero almost everywhere for all theta. Even if this is true for all points except one with probability zero, it still holds. An example is shown where x_n, the nth order statistic, is sufficient and complete when x_i is from a certain distribution.