It is desired to test whether the two brands of batteries differ from each other in terms of their average life span. 80 batteries selected in factory A have an average durability of 135 days and a...

It is desired to test whether the two brands of batteries differ from each other in terms of their average life span. 80 batteries selected in factory A have an average durability of 135 days and a standard deviation of 15 days; The 90 batteries selected in Factory B have an average durability of 130 days and a standard deviation of 18 days. Can it be said that the batteries produced in factory A are more durable at the 1% significance level? What is hypothesis and decision?