A teacher wants to find out whether her new method of teaching is effective or not. She decides to compare the exam grade from the current semester from the exam grade from previous semesters. She calculates hertscore for the current semester to be .39. What can she conclude from this study?

Group of answer choices

She needs to reject the null hypothesis that the new method is not effective.

You need to know the sample size to make a decision about this study.

She cannot prove a null hypothesis, so more data are needed.

She fails to reject the null hypothesis that the new method is not effective.