In specifications (1)–(3) in which both women and men are included, the coefficient for Happiness is marginally significant, indicating that there is a treatment effect for women (the base category for gender).
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The sentences
It confirms, albeit at a marginal significance level, that controlling for gender and major, there is more honest behavior in the Happiness than in the Neutral treatment.
Those who viewed the Happiness video reported a greater degree of happiness afterward than those who had viewed the Neutral video ( t = 1.31, p < 0.1), though the effect is only borderline significant.