I have no Idea what too do with this Problem!!!!!!

Question

I can't solve this please assist

 

Find the critical value z_a/2 that corresponds to the given confidence level 84% 

 

z_a/2 = rounded to two decimal places as needed

Answer 1

I believe the question is asking for a two tail critical value. At an 84% confidence level, we want the probability of not rejecting the null to be equal to a=100%-84%=16%. z scores refer to a normal distribution. Under a normal distribution, we want a/2%=8% in the higher and lower tail. In other words, the critical value closest to 0.92 will give you the two tail 84% confidence interval. Use this table to figure out the z score: 

 

• http://faculty.csupueblo.edu/paul.Chacon/156Spr05/images/normal2.jpg