Answer to Question #332397 in Statistics and Probability for frances

Question

A researcher wants to determine if review sessions affect the performance of the students in written exams. A review session is administrated to sample of 25 students and after the examination, a sample mean of 43 was calculated with a standards deviation of 8. From the previous examinations, it was identified that the population mean for the same exam is 40. Can the researcher conclude that the review session is effective in improving the students’ exam results? Use a = 0.01.