If 12% of the American population is Hispanic, what percentage of a stratified sample would be Hispanic?

The same musical note played on a guitar, a piano, and a flute does not sound the same because most sounds consist of several different frequencies. This distinctive quality of a sound is called _____

a) hertz. b) amplitude. c) unique. d) timbre.

Effective self-regulatory skills

A) are weakly correlated with academic success. B) sometimes interfere with children's task performance. C) foster a sense of academic self-efficacy. D) develop rapidly during the preschool years.