An article reports that the average initial rate of absorption (in g/min.cm²) for a sample of five clay bricks with fine glass particles added was 1299.8 with a standard deviation of 329.8, and the average for another sample of five bricks without glass particles added was 4500.8 with a standard deviation of 271.6. Let Hy represent the population mean without glass particles and let uy represent the population mean with glass particles. Find a 98% confidence interval for the difference.