#### A PHP Error was encountered

Severity: Warning

Message: Undefined array key "userid"

Filename: views/question.php

Line Number: 212

Backtrace:

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

Line: 212

Function: _error_handler

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

Line: 416

Function: view

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

Line: 315

Function: require_once

## A new approach for teaching mathematics was introduced that engages students in group investigations and mathematical modeling

A new approach for teaching mathematics was introduced that engages students in group investigations and mathematical modeling. After field tests in 36 high schools over a three-year period, researchers compared the performances the new approach students with those taught using a traditional curriculum. During the study, students in both classes that used the new approach and traditional classes took a Algebra test that did not allow them to use calculators. The accompanying table shows the results. Are the mean scores of the two groups significantly different? Address the parts that follow.