Dullco Manufacturing claims that its alkaline batteries last at least 40 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 p-value is   Multiple Choice   slightly less than .05.   slightly greater than .05.   uncertain without knowing α.   exactly equal to .05.

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