SCENARIO 9-6
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.She performs a two-tail test of the null hypothesis that the mean for the stressed oak furniture is 650.The calculated value of the Z test statistic is a positive number that leads to a p-value of 0.080 for the test.
-Referring to Scenario 9-6,suppose the engineer had decided that the alternative hypothesis to test was that the mean was greater than 650.What would be the p-value of this one-tail test?
A)0.040
B)0.160
C)0.840
D)0.960

Question

Quizplus · Accepted Answer

In a two-tail test, the p-value is split between both tails of the distribution. Since the original p-value is 0.080 for a two-tail test, for a one-tail test, we only consider one side, which halves the p-value to 0.040.

SCENARIO 9-6 The Quality Control Engineer for a Furniture Manufacturer Is Interested