Vygotsky's long life enabled him to advance his theories and become influential in the field of child development

According to current research, if a person living in the United States is distrustful of both lawyers and congressional members, that type of person is:

A) rare: such distrust defines those with paranoid personality disorder. B) rare: such distrust defines those with schizotypal personality disorder. C) uncommon: great distrust of congressional members but not great distrust of lawyers defines those with paranoid personality disorder. D) common: most people in the United States distrust both lawyers and congressional members.

The mean square (MS) is always equal to (when based on SS/df)

a. the square of the total mean b. the sum of the squares of the separate group means c. the variance squared d. the variance