Can you give any more specifics, such as grade level, branch of science, etc?
How soon do you need it?
No problem. I am working on it now. This is the first chance I have had in days to get to the computer. I have an 11-day old daughter.
I have a lesson plan on measurement of lengths, and different accuracy of rulers. Is that what you need, or do I need to go in a different direction?
If your lines are closer together, you can make more accurate measurements. What do you mean by "error in data collection?" You are not actually finding error% by 3rd grade, are you?