Compute the critical value Zsigma 2 that corresponds to a 9

Compute the critical value Z_sigma / 2 that corresponds to a 91% level of confidence

Solution

Given: 91% of confidence level

We know the steps for finding the critical value

Step 1:

1- Confidence level = `alpha`

1-.91 = `alpha`

`alpha ` = 0.09

Step 2:

`alpha/2` = `0.09/2`

= 0.045 is confidence level

Step 3:

1- Confidence level = `alpha`

1- 0.045 = .91

Step 4:

Use Z-score chart to finding the value of .955

.955 = 1.70

Step 5:

Finally we get critical value is 91% and confidence level is 1.70