Question 14 3 points Save Answ Dullco Manufacturing claims that its alkaline batteries last at least 35 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. To test DullCo's hypothesis, the test statistic is O-1.728 1.980 -1.960 2.200