15- The maker of Surya bulbs wants to demonstrate that their bulbs last on an average of at least 100 hours longer than Ortan bulbs. Two independent random samples of 100 bulbs of each kind are selected. The sample average lives for Surya bulbs found to be 1550 hours and for Ortan bulbs is 2020 heurs. Assume that the standard deviation 3] is 75hrs and the standard deviation s2 is 60hrs respectively. The test Statistic F to test this claim is 3