A manufacturer claims that the average tensile strength of thread A exceeds the average tensile strength of thread B by at least 9 kilograms. Researchers wish to test this claim using a 0.1 level of significance. How large should the samples be if the power of the test is to be 0.95 when the true difference between thread types A and B is 8 kilograms? The population standard deviation for thread A is 6.19 kilograms and the population standard deviation for thread B is 5.53 kilograms. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The minimum sample size required is (Round up to the nearest whole number as needed.)