"D" size batteries produced by MNM Corporation have had a life expectancy of 87 hours. Because of an improved production process, the company believes that there has been an increase in the life expectancy of its "D" size batteries. A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 9 hours. Use a 0.01 level of significance, and test to determine if there has been an increase in the life expectancy of the "D" size batteries. Using the above information to answer questions 32-34. What would be your null and alternative hypotheses?