Which of the following is always true for a chi-square test for goodness of fit or a test for independence? A)Σf_e = n B)Σf_e = Σf_o C)Both Σf_e = n and Σf_e = Σf_o D)Neither Σf_e = n nor Σf_e = Σf_o

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Both Σf_e = n (for goodness of fit test) and Σf_e = Σf_o (for independence test) are always true. The first equation states that the sum of the observed and expected frequencies equals the total sample size, while the second equation states that the sum of the expected frequencies in each category equals the expected frequency under independence.

Which of the Following Is Always True for a Chi-Square