The results from this experiment on acting extraverted show that both men and women were happier when extraverted and less happy when introverted. This indicates a:

Question

BlackTom AI · Accepted Answer

A main effect occurs when one independent variable produces a consistent change in the dependent variable across all levels of another variable. In factorial designs (e.g., extraversion × gender), a main effect of extraversion means that acting extraverted increases happiness regardless of whether participants are male or female.

Relevant concepts:
- Main effect: the overall impact of one IV (extraversion) averaged across levels of another IV (gender).
- Interaction: when the effect of one IV depends on the level of the other IV (e.g., extraversion increases happiness for women but not for men, or increases it more for one gender).
- Simple effect: the effect of one IV at a single level of the other IV (e.g., effect of extraversion only for men).

Step-by-step reasoning:
1. The observed pattern states that both men and women were happier when extraverted and less happy when introverted. That means extraversion raised happiness for each gender.
2. To test for an interaction you would compare the size of the extraversion effect across genders. If the increase in happiness from introversion to extraversion is the same (or similar) for both genders, there is no interaction—only a main effect.
3. Example with numbers: male happiness extraverted = 7, introverted = 3 → difference = +4. Female happiness extraverted = 8, introverted = 4 → difference = +4. Both genders show the same benefit (+4) from extraversion. This produces a clear main effect of extraversion and no interaction.
4. A simple effect would describe the effect of extraversion separately for men or women (e.g., “for men, extraversion increases happiness by 4”), but the question describes the overall pattern for both sexes, which is the main effect.

Why other choices are incorrect:
- Simple effect: incomplete—the statement describes effects in both groups, not one specific group.
- Interaction: incorrect because an interaction requires different effects across genders, which the data do not show.
- Main effect and interaction: would require both a consistent overall effect and differing effects across genders; the description does not indicate differing effects.

Conclusion: The correct characterization is a main effect, matching the provided answer.

The results from this experiment on acting extraverted show that both men and women were happier when extraverted and less happy when introverted. This indicates a:单项选择题

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