Author Question: Why is it preferable to choose a one-sided alternative rather than a two-sided alternative in the ... (Read 82 times)

clmills979 · **on:** Jul 24, 2018

Why is it preferable to choose a one-sided alternative rather than a two-sided alternative in the situation where you are only interested in results that are extreme in one direction?
a. Your p-value would be half as much as it would be for a two-sided test (assuming the test statistic is the same each time, and is in the direction of the one-sided alternative you selected.)
b. Your results don't have to be as extreme in order to achieve statistical significance.
c. Your conclusions can be more informative because they will have a direction associated with them.
d. All of the above.

Question 2

Suppose your test statistic for a two-sided test for the difference in two means resulted in a standard score of 0 . What would the resulting p-value be?
a. 0
b. .5
c. 1
d. Not enough information to tell.