Question: 7.4 For mn2, derive the probability mass function of TN, the sum of the X ranks, under H0. Determine whether this distribution is symmetric and
7.4 For m¼n¼2, derive the probability mass function of TN, the sum of the X ranks, under H0. Determine whether this distribution is symmetric and if so, identify the point of symmetry. Calculate the mean and variance of TN.
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