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A directional test differs from a nondirectional test in that in a directional test the researcher is interested in changes that take place in which of the following ways? a

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A directional test differs from a nondirectional test in that in a directional test the researcher is interested in changes that take place in which of the following ways?

a. Only in a positive direction

b. Only in a negative direction

c. In both positive and negative directions

d. Either in a positive or in a negative direction, but not both