The quality control manager at a cell phone battery factory needs to determine whether the mean life of a large shipment of batteries is equal to the specified value of 375 hours. The process standard deviation is known to be 100 hours. A random sample of 64 batteries indicates a sample mean of 350 hours.
-The test statistic is _____.
A)-16.00
B)-4.00
C)-2.00
D)2.00
E)4.00

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The Answer of The quality control manager at a cell phone battery factory needs to determine whether the mean life of a large shipment of batteries is equal to the specified value of 375 hours. The process standard deviation is known to be 100 hours. A random sample of 64 batteries indicates a sample mean of 350 hours.
-The test statistic is _____.
A)-16.00
B)-4.00
C)-2.00
D)2.00
E)4.00

The Quality Control Manager at a Cell Phone Battery Factory