Dullco Manufacturing claims that its alkaline batteries last forty hours on average in a certain type of portable CD player. Tests on a random sample of 18 batteries showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. In a left-tailed test at = .05 we would

Dullco Manufacturing claims that its alkaline batteries last forty hours on average in a certain type of portable CD player. Tests on a random sample of 18 batteries showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. In a left-tailed test at = .05 we would __________.

A. comfortably accept the claim
B. switch to alpha of 0.01 for a more powerful test
C. comfortably reject the claim
D. feel uncomfortable with either decision (too close)


BUS 475

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