Should the researcher reject the thanks hypothesis or fail to reject it?

Based on the results of this small study, should the researcher continue or discontinue using the technique?

 

A economics researcher wants to test whether a teaching technique used in her university classes increases student understanding of the concepts of supply and demand. To conduct the test, she uses the teaching technique in one of her Principles of Microeconomics classes, but not in the other. Then, she measures the understanding of supply and demand in both classes. The class sizes are identical, with 25 students in each. She finds that in Class #1 (with the teaching technique) the average student score is 3.8 out of 5 on the measure of understanding supply and demand. In Class #2 (without the teaching technique) students score is 3.2. She uses statistical software to conduct a difference in means test, testing the null hypothesis that the teaching technique is ineffective. The software reports a t-statistic of 4.79. She wants to report her answer with 95% confidence.