Scenario #2:

A school psychologist would like to test the effectiveness of a behavior-modification technique in controlling classroom outbursts of unruly children. The teacher used the response-cost technique. Every time a child disrupts the class, he/she loses 10 minutes of free time. Therefore, each unruly act costs the student 10 minutes of free time. The effectiveness of the technique will be measured by counting the number of outbursts in class after different periods of time.

Is there a significant difference in number of outbursts across the observation periods? Set alpha at .05.