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    Can Phi Coefficient be used as an effect size for Chi-Square Goodness of Fit tests?

    Flip a coin 100 times -> 48 H, 52 T Null - coin follows a specified distribution Run a chi-square goodness of fit test using 48, 52 and 50, 50 I get a high P-Value which tells me to accept the null (coin is fair). Why then is the Phi-Coefficient low (2%)...meaning that the association...