The Quality Control Manager of a Major Cell Phone Provider $\alpha$

question 23

Multiple Choice

The quality control manager of a major cell phone provider is concerned about the life of the cell phone batteries they use.He took a sample of 13 batteries from a recent shipment and used them continuously until they failed to work.The manager measured the number of hours the batteries lasted and found the mean to be 550.4 with a standard deviation of 315.3.What is the critical value for $\alpha$ = .10 to test the claim that the mean life of the batteries is more than 400 hours.

• A)-1.356
• B)1.356
• C)1.282
• D)1.782
• E)-1.782

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