If you set alpha to .01 and are conducting a two-tailed test,what value do you need to look up in the normal curve table to determine the cutoff Z score on the comparison distribution?
A).020
B).010
C).005
D).001

Question

Quizplus · Accepted Answer

Since we are conducting a two-tailed test, we need to split the alpha level in half (0.01/2=0.005) to find the critical values for both tails. When looking up the value in a normal curve table, we need to find the area in the tail beyond the critical values, which will be 0.005. Therefore, the cutoff Z score for an alpha level of 0.01 in a two-tailed test is approximately 2.58 (which gives an area of 0.005 in each tail).

If You Set Alpha to