In two-tailed tests, ______.
A. there is only a single critical value needed to determine if a statistically significant relationship exists between the variables under study.
B. there is a single critical value, determined by the alpha level, needed to determine if a statistically significant relationship exists between the variables under study.
C. there are three critical values needed to determine statistical significance; one determined by the alpha level, one determined by the critical value, and one determined by the difference between the sample means.
D. there are two critical values needed to determine statistical significance; one positive and one negative.
D. there are two critical values needed to determine statistical significance; one positive and one negative.
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