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A chisquare independence testis to be conducted to decide whether an association exists between two variables of a population. One variable has seven possible values

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A chisquare independence testis to be conducted to decide whether an association exists between two variables of a population. One variable has seven possible values and the other variable has nine. What is the degrees of freedom for the xz-statistic? The number of degrees of freedom for the XZ-statistic is :l

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