Tuesday 5 June 2012

Dullco Manufacturing claims that its alkaline batteries last forty hours

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)
 

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