Ononot — Consider two independent datasets A and B. Dataset A has nA

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Descriptive Statisticshard

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Consider two independent datasets $A$ and $B$ . Dataset $A$ has $n_A = 20, \bar{x}_A = 10, s_A^2 = 4$ . Dataset $B$ has $n_B = 30, \bar{x}_B = 20, s_B^2 = 9$ . What is the variance of the combined dataset?