Dullco Manufacturing claims that its alkaline batteries last forty hours - 3256

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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)

 
Solution Description

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 bat