A researcher predicts that a behavioral treatment will alter an individual’s IQ score, which have known parameters (µ = 100,  σ = 15). The critical cutoff scores would equal ?  (alpha = .05) a. Zcritical = ± 1.96 b. Zcritical = + 1.64 c. Zcritical = - 1.64 d. T critical = ± 1.96

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