Which of the following could serve as an experimental hypothesis?

Which of the following could serve as an experimental hypothesis?

a. Although 25% of U.S. drivers say that they use the seatbelts in their cars, only 14% really do.
b. A case history of multiple personality appeared to be caused by traumatic childhood experiences.
c. College women who are anxious tend to want to be together.
d. As the temperature increases, the number of hit batters in baseball increases.


Science

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