When testing vs. , the observed value of the z-score was found to be -2.15. What is the p-value for this test?
A) 0.0158
B) 0.0316
C) 0.9684
D) 0.9842

Question

When testing  vs.  , the observed value of the z-score was found to be -2.15. What is the p-value for this test?
A) 0.0158 
B) 0.0316 
C) 0.9684 
D) 0.9842

Quizplus · Accepted Answer

Since the z-score is negative, we are interested in finding the area to the left of -2.15 in the standard normal distribution. Using a standard normal table or calculator, we find that the area to the left of -2.15 is approximately 0.0316. This is the p-value for the test, so the best choice is B.

When Testing Vs