-Accuracy is the closeness of measured value to correct value, while precision is the closeness of measured value to other measured values
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It so important for measurements in an experiment to be accurate and precise because you need to get accurate and precisise results.
-If your measuring instrument always gives values that are closely grouped - precise - they will be of little value if the calibration of the equipment is such that the measured values are not correct - accurate. Similarly, if the equipment is calibrated correctly but your measurements vary wildly you will not know which measurement, if any, is correct.
The reason they have to be so accurate and precise is because, let's say you were doing a lab or something that was involving chemicals. If you had to put a certain amount of chemicals in your experiment, but when you were doing to the math, you messed up and didn't go back and even bother to fix it, that is a really BIG issue. Because something will probably happen to your chemicals because you might have added to much of something into it. So that's why you always have to be so precise and accurate!
