Example # 2: Find
Za
for the confidence level 90%.
2
Example # 3:
Find 2, for the confidence level 99%.

(a) 1.645

(b) 2.5758

Step-by-step explanation:

The complete question is: Find Z(/2) for the confidence level 90% and for the confidence level 99%.

Firstly, as we know that represent the level of significance, i.e;

Level of significance = 1 - confidence level

(a) We are given the confidence level of 90%, so;

     Level of significance = 1 - 90%

                                         = 1 - 0.90 = 0.10 or 10%

Now, = =

This means that we have to look for a critical value in the z table at a 5% level of significance which gives us a value of 1.645.

(a) We are given the confidence level of 99%, so;

     Level of significance = 1 - 99%

                                         = 1 - 0.99 = 0.01 or 1%

Now, = =

This means that we have to look for a critical value in the z table at a 0.5% level of significance which gives us a value of 2.5758.

c: y > - 1/6x + 1

step-by-step explanation:

dashed line - meaning this < or > also not equal

solid line - meaning this < or > also equal

your answer is c because y > means up & it's shaded up, but y < means down

hope this ! : )