Question 974874
Use a table like this one


<img src = "http://i.stack.imgur.com/PiSUh.png">


look at the bottom row that starts with Z. In that row, you'll see 1.960. Right below it is 95%


So a <font size=5 color="red">95%</font> confidence level corresponds to z(&#945;/2) = 1.96


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