A group of 8 students were given the same standardized test twice to see whether retaking the test affected the score. The table - 30 40 gives the score differences for the 8 students. Use the paired t-interval procedure to determine a 95% confidence interval for the - 50 - 40 difference between the mean scores on the first test and the second test (retake). (Note: d = 2.5 and So = 52.03.) 90 30 30 - 50 . . . The 95% confidence interval is from to (Round to two decimal places as needed.)