​Marcella is interested in studying the physical development…

​Marcella is interested in studying the physical development of girls between 7 and 10 years of age. It is impractical to think that she could study every such girl in the country, so instead she selects a smaller group of girls in this age range to study. The group that Marcella studies is a(n) ________, and the larger group that they represent is a(n) ________.

​Erik is having difficulty saying his “Rs,” which is particu…

​Erik is having difficulty saying his “Rs,” which is particularly problematic given his first name. When he tries to say “ERIK,” it ends up sounding like “EWIK.” His parents have him working with a speech therapist to help him overcome this small problem. Technically, Erik’s problem lies with mispronunciation of a(n)