Atutor promised to improve the scores of statistics students by more than 5% after three lessons. To assess the validity of his claim. the tutor took a sample of 49 students' test scores before and alter they received tuition. The mean difference was 5.3% higher alter tuition: with the standard deviation of the difference being 1.2%. Let no denote the mean difference [score after tuition minus score before tuition}. Which ofthe following hypotheses will determine if the students improved their test scores by more than 5%, on average. after receiving tuition