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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

An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are A. 4 and 17
B. 3 and 16 
C. 3 and 19 
D. 3 and 20