What is a correct argument for using a two-tailed test, even if there is a clear basis for predicting a result in a specific direction?
A) If the null hypothesis is in fact true, a failure to reject it will give stronger evidence in support of it.
B) One-tailed tests cannot be used in almost any real study involving two groups.
C) If the result is opposite of what is predicted, it does not have to be ignored.
D) A two-tailed test gives one a better chance of obtaining a significant result.
Answer: C
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