We conduct a study to explore if a tutorial program has an effect on students' test scores. We randomly selected 15 students from Valley High and recorder their test scores before and after enrolling in the tutorial program. The results are as follows: Test score data Before After Difference Mean 68.22 72.51 -4.29 St 18.80 16.28 32.22 dev Assuming the data are Normal, construct a 90% confidence for the change in mean score for Valley high students. Round your answer to 3 decimal places. O (-5.436,-3.144) O (6.641,15.221) O (-18.943,10.363) O (10.363,18.943) O (-15.221,6.641)