State the null and alternative hypotheses for each of the following situations (each ½ point): a) A guideline for a telemarketing company states the mean time for completed calls should not exceed four minutes. Each month the company’s owner selects a random sample of call logs to determine whether the call-time goal is being met. b) General Crunch Corporation distributes Mini-Oats Cereal in boxes with a stated weight of 18 ounces. To determine whether the filling machine should be adjusted, the quality control manager at General Crunch selects and weighs a random sample of boxes one day each week. c) A manufacturer of trash bags claims its new trash bag can hold or support at least 50 pounds, on average. A random sample of new trash bags is selected and tested. d) Your friend claims the battery life of an iPad mini is less than 5 hrs, on average. You survey a random sample of friends who own an iPad mini to test your friend’s claim.