Does an experiment have to be repeated for it to have valid results?

no, needs repeatable. repeating experiment doesn't confirm results. if results wrong because equipment faulty or analysis method incorrect, repeating same wrong results.

how confirmation need in practice varies depending on how unexpected results , how trusted methods are. if results confirm existing theory, may not necessary. if you're using well-established methods , off-the-shelf equipment, repeating experiments multiple times isn't necessary. it's do, in cases it's not practical due cost, time, or both.

Science & Mathematics Other - Science Next