Cowles and Davis’s logistic regression of volunteering on sex, neuroticism, extraversion and the product of neuroticism and extraversion is discussed in Section 17.1. Show that (a) interactions...

Cowles and Davis’s logistic regression of volunteering on sex, neuroticism, extraversion and the product of neuroticism and extraversion is discussed in Section 17.1. Show that (a) interactions between sex and the other factors and (b) squared terms in neuroticism and extraversion are not required in this model.