Which of these statements is correct about one- and two-tailed tests?
A. A statistical model that tests a directional hypothesis is called a one-tailed test, whereas one testing a non-directional hypothesis is called a two-tailed test
B. A statistical model that tests a non-directional hypothesis is called a one-tailed test, whereas one testing a directional hypothesis is called a two-tailed test.
C. A two-tailed test is a more powerful test than a one-tailed test.
D. A one-tailed test is a more accurate test than a two-tailed test.
Answer: A
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