Two rubber compounds were tested for tensile strength and the fol- lowing values were found A : 32, 30, 33, 32, 29, 34, 32 B : 33, 35, 36, 37, 35, 34 Under the assumption that the two populations are normally distributed, test the hypothesis that the average tensile strength of the two rubber compounds is different using significance level a = 0.01 and a = 0.05