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A random sample of 16 ATM transactions at the Northfield Savings Bank


A random sample of 16 ATM transactions at the Northfield Savings Bank (a popular bank in the greater Burlington area) revealed a mean transaction time of 2.8 minutes with a standard deviation of 1.2 minutes. The width (in minutes) of the 95 percent confidence interval for the true mean transaction time is 

A ±0.300 

B ±0.639 

C ±0.588 

D ±2.131 

math   Statistics-And-Probability   
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