Comment: No actually what the professor did was use a cheap

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No actually what the professor did was use a cheap

standard analog bulb thermometer (no container needed) to determine the more accurate temperature. This worked better because there was no air buffer around it and thus it came to a steady state temperature quicker. So you can run all of your statistical equations that you want but it will never detect the bias within a category of measuring devices. And that's why the good scientists will always try to corroborate data across completely different types of measuring devices/methods.