Which of the following are probable sources of error in a scientific experiment? Check all of the boxes that apply.

Using different thermometers can introduce inconsistent measurements, making A a probable source of error. If the design does not test the proposed hypothesis, as in C, the experiment cannot reliably answer its question. Giving the control plants more light than the experimental plants adds a confounding difference, so E is also an error. Careful double-checking, random sampling across the tree, and recalibrating the scale help reduce error.

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