The Myrtle Beach International Airport provides a cell phone parking lot where people can wait for a message to pick up arriving passengers. To decide if the cell phone lot has enough parking places, the manager of airport parking needs to know if the mean time in the lot is more than 15 minutes. A sample of 12 recent customers showed they were in the lot the following lengths of time, in minutes. 30 24 28 22 14 2 39 23 23 28 12 (a)State the null hypothesis and the alternate hypothesis. (b) Show the decision rule graphically. Use the .05 significance level. (c) Compute the value of t. What is your decision regarding the null hypothesis? Briefly + summarize your results. hint: you can use software excel to answer this question, but you should list necessary process. 31