An automobile manufacturer has given its jeep a 26.5 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this jeep since it is believed that the jeep performs over the manufacturer's MPG rating. After testing 240 jeeps, they found a mean MPG of 26.7. Assume the population standard deviation is known to be 2.5. Is there sufficient evidence at the 0.05 level to support the testing firm's claim? Step 1 of 6: State the null and alternative hypotheses.