Integrated School wants to know which better is in teaching Statistics and probability. He took a random sample of 35 students teaching with the use of a graphing calculator, and found to have a mean final grade of 81 with a standard deviation of 9. Forty students from a group being taught without using the graphing calculator and it was found out that they have the mean final grade of 89 with a standard deviation of 10. Does this indicate that the use of a graphing calculators really helps significantly to students' performance.