A researcher was interested in the effects of arousal and personality on individuals' GRE test performance.The personality variable he examined was individuals' level of introversion-extraversion.Based on questionnaire responses,each participant was classified as an "extravert" or an "introvert." The researcher manipulated arousal level by giving caffeine to participants prior to administering a practice GRE test.Participants were randomly assigned to a high-caffeine condition,a medium-caffeine condition,or the no-caffeine condition.All participants then completed a version of the quantitative portion of the GRE.
Suppose the researcher observed the following means for each group: 
Identify the means for the main effect of each independent variable and indicate whether you believe the main effects would be statistically significant.
Definitions:
Stereotyping and Discrimination
The unjust or prejudicial treatment of different categories of people, often based on oversimplified beliefs or characteristics.
Developing Network
The process of expanding one's group of contacts or connections for personal or professional growth.
Source of Information
The origin or provider of data, facts, and materials from which knowledge is obtained or derived.
Sales Message
Communications aimed at encouraging the receiver to purchase a product or service; a rephrased definition of earlier presented sales messages.
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