A ressearcher reports that her obtained chi square of -17.56 is significant because it exceeds the critical Chi square of -3.841 for an alpha of .05 with 2 degrees of freedom. What mistake has been made? a. neither critical nor obtained Chi squares can have negative values b. it is impossible to have only 2 degrees of freedom c. it is impossible for obtained Chi square to exceed 10 d. a one-tailed test should have been used

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