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circle graph
a circle graph is the best graph to use for that!!
double-bar graph
A bar graph is best to compare the levels because you can have 6 different color bars connected on a graph to compare the lead contamination levels.
histogram
histogram
I suppose you are doing this for a science progect :D The best graph to use in your situation is a line graph. A line graph shows data along a period of time, and your bean plants grew over a period of time. If you did different sets of data like one bean plant got no radiation, one got some, and one got a lot, then mark each one across the line graph in different colors for each one. The colors should be dark and easy to see.
a bar graph
A line graph is the best graph.
histogram
Pie Chart
The best graph for the purpose of comparing raw numbers between different qualitative categories would be a bar graph or some variation thereof.
circle graph
I believe a bar graph is best, and could be easily understood by children. It can be quickly made in Excel (Win), Numbers (Mac) or Gnumeric (Linux).
Circle graph
circle graph
circle graph