Answer
Using Table-E of the book, we have:
a. $z_{a/2}$ for the 99% confidence interval = 2.58
b. $z_{a/2}$ for the 98% confidence interval = 2.33
c. $z_{a/2}$ for the 95% confidence interval = 1.96
d. $z_{a/2}$ for the 90% confidence interval = 1.65
3. $z_{a/2}$ for the 94% confidence interval = 1.88
Work Step by Step
Given above