95% confidence interval with graph

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Suppose a poll finds that 39% of 40000 married voters support a candidate in an election. What is the 95% confidence interval of this survey

 

I found a powerpoint presentation on the net that shows the picture to be created in word or powerpoint  that is supposed to be included with the answer to the question.  Slides 5 and 6 are one of these pictures

 
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