This is my first question on Cross Validated here, so please help me out even if it seems trivial :-) First of all, the question might be an outcome of language differences or perhaps me having real deficiencies in statistics. Nevertheless, here it is:
In population statistics, are variation and variance the same terms? If not, what is the difference between the two?
I know that variance is the square of standard deviation. I also know that it is a measure of how sparse the data is, and I know how to compute it.
However, I've been following a Coursera.org course called "Model Thinking", and the lecturer clearly described variance but was constantly calling it variation. That got me confused a bit.
To be fair, he always talked about computing variation of some particular instance in a population.
Could someone make it clear to me if those are interchangeable, or perhaps I'm missing something?