Quiz navigation Question 16 Having done poorly on a particular exam in a junior high school, 24 students decide to write the exam again to try and improve their mark. Results are given in the following table. 1 2 3 4 5 6 Tries remaining: 3 9 10 11 12 Marked out of Student n Average Standard deviation 3.00 Attempt 1 (A1) 24 50 3.6 Flag Attempt 2 (A2) 24 55 4.7 13 14 15 16 17 18 question Difference (d = A1 - 24 -5.0 2.7 A 2 ) 19 20 (a) Find a 90% confidence interval for the difference in mean scores between attempt 1 and attempt 2. Finish attempt ... (Round your answers to 4 decimal places, if needed.) (b) Based on this confidence interval, can we conclude there is a difference in mean scores between attempt 1 and attempt 2? No, since the interval is completely below 0. No, since the interval contains 0. Yes, since the interval is completely below 0. Yes, since the interval contains 0. Check Last saved at 17:40:07 Save Progress Previous page Next page