Question

Find the critical value z Subscript c necessary to form a confidence interval at the level of confidence shown below. c=0.82

Answer 1

Solution,

At 0.82 confidence level the z is ,

$\alpha$  = 1 - 0.82 = 0.18

$\alpha$ / 2 = 0.18 / 2 = 0.09

Z_$\alpha$/2 = Z_0.09 = 1.34

Z critical value = 1.34

Answer 2

Find the critical value z Subscript c necessary to form a confidence interval at the level of confidence shown below. c=0.83