In American culture, which of the following body types would most boys prefer to have?

Which of the following statements is true about sibling influences on gender typing?

A) Younger siblings tend to have a significant and lasting impact on older siblings' gender typing. B) Sibling effects on gender typing are more complex than peer influences because they depend on birth order and family size. C) Contrary to popular belief, birth order and family size have little, if any, impact on children's gender typing. D) Children with same-sex siblings are less gender-typed than children with no siblings.

To identify which means differ following a significant F-test, researchers use

a. sum of squares b. t-tests c. follow-up tests d. ANOVA e. interaction tests