Random and systematic errors

Random errors and systematic errors are ways that measurements are sometimes wrong. Random errors are when the measurements are a little off and don't always happen the same way. For example, if you use a ruler to measure the same thing over and over and sometimes it is a little bit different, that is a random error. Systematic errors are when the measurements are off in the same way each time. For example, if your ruler had a little kink in it, every measurement you took with it would be too short, so that would be a systematic error.