A survey revealed the amount of pocket money held by each student in a sample of students from Statistics 205. The amounts (in dollars) are 5.50, 10.20, 3.15, 6.08, 4.85, 4.80, 4.70, 8.52, 7.90, 6.10, 3.50, 5.40, 7.10, 9.60, 6.20, and 4.28. Assuming find the 99.74% confidence interval for the population mean