Solve the problem.
-Find the value of ${ } ^ { Z } \alpha / 2$ that corresponds to a level of confidence of 98.22 percent.
A)2.1
B)2.37
C)0.0089
D)-2.37

Question

Quizplus · Accepted Answer

The level of confidence of 98.22 percent means that the area in the two tails of the normal distribution (outside the confidence interval) is 1.78 percent (100% - 98.22%). Since this area is split between the two tails, each tail has an area of 0.89 percent. Looking up this area in the z-table to find the corresponding z-value gives us a z-value of approximately 2.37.

Solve the Problem Zα/2{ } ^ { Z } \alpha / 2Zα/2

Solve the Problem ${ } ^ { Z } \alpha / 2$