Use the following table to answer question: P(M A) is approximately _____. A. .50 B. .25 C. .125 D. .625

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User: Use the following table to answer question:
P(M A) is approximately _____.
A. .50
B. .25
C. .125
D. .625

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

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