udy is conducted to find the mean life of a certain manufacturer's car batteries. A random sample of 34 batteries is selected and a mean of 47.5 months with a standard deviation of 7.3 months is found. Find a 95% confidence interval for the mean battery life. State the margin of error . Round to 2 decimal places. What value for  or  did you use in this calculation? State the confidence in

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A study is conducted to find the mean life of a certain manufacturer's car batteries. A random sample of 34 batteries is selected and a mean of 47.5 months with a standard deviation of 7.3 months is found. Find a 95% confidence interval for the mean battery life.

State the margin of error . Round to 2 decimal places.


What value for  or  did you use in this calculation?


State the confidence interval:
(  <  <  )

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