In a random sample of 70 bolts with a sample mean length of


Use a normal distribution or a t-distribution to find a  95% C.I. for the following: 

In a random sample of 70 bolts with a sample mean length of 1.25 inches and a standard deviation of .01 inches.  What is the CI?

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Basic Statistics: In a random sample of 70 bolts with a sample mean length of
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