There is reason to believe that the corporations in cle arence in dividends and assess 25 per cent confidence interval for the population use Buying the I-test, vel of significance assess whether the electronic industry pays higher than the are 700 Samples of two different types o (tu Two types of batteries are tested for their length of life and the following data are obtained Sample Size Mean Life Variance ( honey Electron no differ- Sample Size Sample Mean Sample S.D. Sample size Mean dividend (HP) 1 136 hours 36 hours Type B 144 240 Is there a significant difference in the two means