Can we make a directional conclusion in a two-tailed test? a No, because it woul
ID: 3171016 • Letter: C
Question
Can we make a directional conclusion in a two-tailed test?
a
No, because it would not conform to the standard set forth by the APA Publication Manual.
b
No, because a two-tailed test is non-directional.
c
Yes, because a two-tailed test is a directional test.
d
Yes, because a two-tailed test is the same as a one-tailed test with at half the alpha level.
a
No, because it would not conform to the standard set forth by the APA Publication Manual.
b
No, because a two-tailed test is non-directional.
c
Yes, because a two-tailed test is a directional test.
d
Yes, because a two-tailed test is the same as a one-tailed test with at half the alpha level.
Explanation / Answer
Correct answer is Option d
Yes, because a two-tailed test is the same as a one-tailed test with at half the alpha level.
For example,
If flipping a coin, testing whether it is biased towards heads is a one-tailed test, and getting data of "all heads" would be seen as highly significant, while getting data of "all tails" would be not significant at all (p = 1).
By contrast, testing whether it is biased in either direction is a two-tailed test, and either "all heads" or "all tails" would both be seen as highly significant data.
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