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A researcher wants to know if there is a difference between 12th graders and 9th graders...

A researcher wants to know if there is a difference between 12th graders and 9th graders on the ABC memory test. What is the direction for this research hypothesis?

Choices:

one-tailed

two-tailed

no direction

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math   Statistics-And-Probability   
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A researcher wants to know if there is a difference between 12 th graders & 9the graders on ABC memory test , the direction of this research hypothesis is two tailed test.

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