A few days ago

What is the proper method for closing the documentation on an experiment that failed due to procedural error?

This is for a fourth grader. He discovered after doing 3 days of detailed observations, photographs, graphs and narrative documentation in his journal, that the experiment failed (plant died) due to the way he prepared the specimen. He is going to repeat the experiment and set up a new data sheet, experiment write up sheet, etc. and wanted to just throw the old documentation away.

I think there are things to be learned from the work he has done and suggested he just summarize a final observation of the specimen and hypothesize why this occured. We wanted to know how this is handled in a school setting. (we homeschool)

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A few days ago

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You are correct, he would write a conclusion explaining why why he thought the hypothesis was disproved.