When computing the p-value for a two-tailed hypothesis test, we need to
A)multiply two times the one-tail value
B)divide the upper p-value by two
C)multiply the $\alpha$ value by two
D)subtract the one-tail lower p-value from the one-tail upper p-value
E)none of the above

Question

Quizplus · Accepted Answer

For a two-tailed hypothesis test, the p-value is calculated by taking the one-tail p-value (the probability of observing a test statistic as extreme as, or more extreme than, the observed value under the null hypothesis) and multiplying it by two. This accounts for the two directions (tails) in which the alternative hypothesis can lie relative to the null hypothesis.

When Computing the P-Value for a Two-Tailed Hypothesis Test, We α\alphaα

When Computing the P-Value for a Two-Tailed Hypothesis Test, We $\alpha$