#### 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

## In the morning class, the mean on the first exam was 78 with a standard deviation of 2.3 for

In the morning class, the mean on the first exam was 78 with a standard deviation of 2.3 for

the 57 students in the class. In the afternoon class, the mean was 81 with a standard deviation

of 5.7 for the 37 students in the class. Determine the 90% confidence interval for the

difference in the means of the two groups

__