A manufacturing firm claims that the batteries used in their electronic games will last an average of 30 hours. To maintain this average L6 batteries are tested each month. If the computed /-value falls between —t_0.025 and t_0.025, the firm is satisfied with its claim. What conclusion should the firm draw from a sample that has a mean x = 27.5 hours and a standard deviation a = 5 hours? Assume the distribution of battery lives to be approximately normal.