2. A distributor claims that the average strength of brand A thread exceeds the average strength of brand B thread. To test its claim, 25 pieces of each brand were tested under similar conditions. Brand A has an average strength of 87.6 kilograms with a standard deviation of 6.82 kilograms, while brand B had an average strength of 88.7 kilograms with a standard deviation of 5.64 kilograms. Test whether its claim is correct at 0.05 level of significance