In Belgium, what percentage of 18-year-olds attend religious services at least once a month?

Which of the following is the correct definition of "correlation"?

a. Characteristics of behavior or experience that cause other phenomenon.. b. Characteristics of behavior or experience that can be measured or described by a numeric scale. c. A measure of how strongly two variables are related to one another. d. A descriptive study that looks for a consistent relationship between two phenomena.

Most young adolescents, especially those who receive a formal high school education, are at the level of thinking that Piaget described as:

a) formal operations. b) preoperational. c) preconventional. d) identity versus role confusion.