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    x2 is calculated by the help of formula

    • x2 = Ʃ(O-E)2/E
    • x2 = Ʃ(O-E)/(E)2
    • x2 = Ʃ(O-E)2/ƩO
    • x2 = Ʃ(O-E)2/Ʃ(O)2
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