Joshua designs a research study to investigate the relationship between two variables: the size of a person's head and I.Q.level.He measures each variable without manipulating either of the variables and finds that I.Q.is higher for subjects with bigger heads.In the context of correlational research,what can Joshua conclude?
A) A large head size causes high I.Q.
B) Head size and I.Q are negatively correlated.
C) A high I.Q.causes a large head size.
D) I.Q.and head size are positively correlated.
Correct Answer:
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