Having done poorly on a particular exam in ajunior high school. 22 students decide to write the exam again to try and improve their mark Results are given in the following table. Student n Average Standard deviation Attempt 1 [A 22 58 3.4 Attempt 2 (Ag) 22 63 4.1 Difference [d = A1 , A2) 22 75.0 2.6 {a} Find a 98% condence interval for the difference in mean scores between attempt 1 and attempt 2. (Round your answers to 4 decimal places, if needed.) (1:, E) (b) Based on this condence interval. can we conclude there is a difference in mean scores between attempt 1 and attempt 2? 0 Yes, since the interval is completely below 0. 0 Yes, since the interval contains 0. O No, since the interval contains 0. O No, since the interval is completely below 0. Check