I have a doubt and i need to understand it.

At my work, my colleagues use the coefficient of variation for doing confidence intervals.

Not directly, obvious.

They used this formula for the lower interval

Code:

`X-Z(95%)*X*Coefficient of variation/100`

And i just don't get it.

I've played with it and tried to take it to the class familiar way

Code:

`X-Z(95%)*Standard Deviation/Square Root(n)`

What am i forgetting to assimilate this new way of creating intervals?

Thanks a lot for your replies and time.