A company conducted an experiment to determine the effect of two types of incentive pay plans on worker productivity for workers of two shifts. The company used an equal number of production workers from each of the two shifts and one-half of these workers were assigned to each plan. Then five workers from each pay plan-shift combination were selected and their productivity (in number of items produced) recorded for a one week period. The following output was generated using Minitab: 
Is there significant interaction present in this problem? Let 
= 0.05.
The p-value ______________ indicate significant interaction.
Based on the previous answer, is testing for the main effects, plan and shift, appropriate?
________________________________________________________
Definitions:
Adolescents
Individuals in the transitional stage of human development that occurs between childhood and adulthood, typically ranging from ages 10 to 19.
Nonalcohol Dependent
Refers to individuals who do not exhibit a physical or psychological dependence on alcohol.
Positive Expectancies
Involves the belief or anticipation that future events will be favorable or beneficial.
Aggressive
Characterized by or showing tendencies to behave in a hostile way towards others.
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