A researcher is investigating verbal behavior among introverts and extroverts. The researcher first tests participants and classifies them as either introverted or extroverted. She then randomly assigns participants to a high anxiety or a low anxiety social group and observes the number of words spoken by participants. The researcher wants to learn more about the effects of both personality style-introversion or extroversion-and social situation-high or low anxiety-on verbal behavior. In this case, verbal behavior is defined as the number of verbal communications uttered within a 5-minute observation period. What type of design is this? Provide an example of a possible main effect that might emerge from this study. Additionally, provide an example of a possible interaction that might emerge