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Question 1 (1 point) Saved A substance abuse counselor was treating heroin addicts with contingency management and methadone. There were three conditions for the contingency management procedure: a 1-day contingency, a 1-week contingency, or a 1-month contingency on heroin-free samples. There were three conditions for the methadone: a 0.25 mL/kg, a 0.50 mL/kg, or a 0.75 mL/kg dose. What is the null hypothesis for the contingency management x methadone interaction? Contingency Management (CM) 1-day contingency 1-week contingency 1-month contingency 1-day CM x 1-week CM x 1-month CM x 0.75 mL/kg 0.75 mL/kg 0.75 mL/kg 0.75 mL/kg 1-day CM x 1-week CM x 1-month CM x 0.50 mL/kg Methadone 0.50 mL/kg 0.50 mL/kg 0.50 mL/kg 0.25 mL/kg 1-day CM x 1-week CM x 1-month CM x 0.25 mL/kg 0.25 mL/kg 0.25 mL/kg 3x3 between-subjects factorial design with contingency management and methadone Not all the means for the levels of factor B are equal All the mean differences are explained by the main effects of the individual factors None of the mean differences are explained by the main effects of the individual factors Some of the mean differences are explained by the main effects of the individual factors