1.) In developmental research, a cohort is:

A. multiple generations of a single family

B. a group of individuals born at around the same time

C. the sample randomly selected from the entire range of ages targeted

D. the sample left after attrition

2.) Which of the following statements are true about quasi-experimental designs:

A. all of these statements are true

B. conclusions are open to alternative explanations or confounds

C. cannot conclude cause / effect

D. lacks internal validity