(A) Write a correct null and alternative hypothesis for testing the claim that the mean life of a battery for a cell phone is at least 80 hours. (B) Describe what a type I and type II error would be for each of the following null hypotheses: Ho: This is not the shortest route from A to B. Solution a. Ho:the mean life of a battery for a cell phone is not at least 80 hours. Ha:the mean life of a battery for a cell phone is at least 80 hours. ------------------------------------------------------- b. Type I error: This is the shortest route from A to B when Ho is right Type II error: This is not the shortest route from A to B when H0 is false.