Question

Find the critical value z_a/2 needed to construct a confidence interval with level 95%. 

Round the answer to two decimal places. 

The critical value for the 95% confidence level is _______ .

Answer 1

DATE:30-07-2020

ANSWER:---------

Step 1:Subtract Confidence level from 100% to find the Alpha level=100%-95%=5%.

Step 2:Convert step 1 to Decimal places 5%=0.05

Step 3:Divid step 2 by 2(Alpha/2)=0.025

Step 4:Subtract step 3 from 1 (because we Area in middle ,not in the tail)

            =1-0.025

            =0.975

The critical value for the 95% confidence level is 1.96.(Z value from P=0.025)

From the following below table for various Confidende levels.