Researchers compared the final exam grades of 500 students in an Introduction to Psychology in 2020 and 545 students in an Introduction to Psychology class in 2024. They calculated a 95% confidence interval of the difference between means as [-2.6, -0.5]. What hypothesis test decision (assuming alpha = .05) should be made based on this confidence interval? O Accept the research hypothesis D Reject the null hypothesis Run the hypothesis test again O Fail to reject the null hypothesis