Question

Find the critical value Zc necessary to form a confidence interval at the level of confidence c=0.82 what does Zc=

Answer 1

Answer:

The z-critical values are:

$z_{0.09}=-1.34\\\\z_{0.91}=1.34$

Step-by-step explanation:

The confidence level is, c% = 82%.

The significance level for the two tails are:

Left tailed:

$\frac{\alpha}{2} =\frac{1-c\%}{2}$

   $=\frac{1-0.82}{2}\\\\=\frac{0.18}{2}\\\\\=0.09$

Right tailed:

$1-\frac{\alpha}{2} =1-\frac{1-c\%}{2}$

         $=1-0.09\\\\=0.91$

The z-critical values are:

$z_{0.09}=-1.34\\\\z_{0.91}=1.34$

*Use the z-table.