Which of the Following Procedures Would Yield the Most Appropriate

Multiple Choice

Which of the following procedures would yield the most appropriate data for studying the relationship between intelligence and achievement?

A) Administering an achievement test and an intelligence test to one sample of subjects
B) Administering an achievement test to one sample of subjects and an intelligence test to another sample of subjects
C) Administering an achievement test to one sample of subjects, all of whom have an I.Q. of 100
D) Administering an achievement test to two samples of subjects and an intelligence test to two different samples of subjects