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How to solve the expectation and variance of signed rank test
Summary reflects the expectation of symbolic rank test, and the calculation formula is Dx=FV. Variance is a measure of dispersion when probability theory and statistical variance measure random variables or a set of data. Variance in probability theory is used to measure the deviation between random variables and their mathematical expectations (that is, the mean value). Probability theory is a branch of mathematics that studies the quantitative laws of random phenomena.