Posted by **Robocop** on Tuesday, January 29, 2013 at 3:29pm.

Hi,

I need some help with a problem. Here is my example that I am studying.

Find a 95% C.I. for the population mean.

Same size 36

N(u, 64)

sample mean 51.8

51.8+-(4/3)(1.96)

Where does the 1.96 come from? 4/3=64/36 so I understand that.

Thanks

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