Hello Guys I have these problem and Im stuck solving it can

Hello Guys, I have these problem and I\'m stuck solving it, can anyone help me with that ?

Solution

8.1)
a)
Z-score = 2.14

=>
|Z| <2.14

=> confidence level = 96.76%

b)

|Z| <2.496

=> confidence level= 98.74%

c)

|z| < 1.85

confidence level = 93.57%

d)

|z| < 2.00

confidence level = 95.545%

e)

|z| < 1.96

confidence level = 95%