Dullco Manufacturing Claims That Its Alkaline Batteries Last at Least

question 88

Multiple Choice

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. In a left-tailed test at α = .05, which is the most accurate statement?

• A)We would strongly reject the claim.
• B)We would clearly fail to reject the claim.
• C)We would face a rather close decision.
• D)We would switch to α = .01 for a more powerful test.

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