#### A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 192

Backtrace:

File: /home/noqkocv1izd6/public_html/application/views/question.php

Line: 192

Function: _error_handler

File: /home/noqkocv1izd6/public_html/application/controllers/Questions.php

Line: 416

Function: view

File: /home/noqkocv1izd6/public_html/index.php

Line: 315

Function: require_once

## To construct a confidence interval using the given confidence level, do whichever of the following is

To construct a confidence interval using the given confidence level, do whichever of the following is appropriate. (a) Find the critical value z_alpha/2

,

(b) find the critical value t_alpha/2, or (c) state that neither the normal nor the t distribution applies.

choose the correct answer below.

a. z_alpha/2 = 1.96

b. t_alpha/2 = 1.660

c. t_alpha/2 = 1.984

d. z_alpha/2 = 1.645

e. Neither the normal nor the t distribution applies.