Which of the following is a necessary component of a longitudinal design?
A) Measuring the same variables at two points in time
B) Measuring at least four variables at one time
C) Measuring different age groups at two different times
D) Manipulating a variable at two points in time
E) None of the above

Question

Quizplus · Accepted Answer

A longitudinal design involves measuring the same variables at two or more points in time in order to see how they change over time. Measuring different variables at one time (B), measuring different age groups at different times (C), and manipulating a variable (D) are not necessarily components of a longitudinal design. E is incorrect because A is the correct answer.

Which of the Following Is a Necessary Component of a Longitudinal