The best way to see more samples is to download the component and open the chart list in the back end. You'll have lots of samples you can experiment with. Here are some average temperatures for a year, with a polynomial trendline added:
This one plots some simple time functions, updating every 15 seconds:
A pie chart of the most popular articles on this site. The SQL here is simply "SELECT title, hits FROM jos_content order by hits desc limit 10".