Suppose two scientists perform the same experiment separately, but their results are very different. what could they do to find out why this happened

1) they could repeat the experiment - if the result of the experiment is the same as the result of one of the scientist, we know that the other scientist committed a mistake

2) they could analyse whether their conditions were the same - maybe one experimenter used a different setting, or different subject? sometimes even some small variations change the effect - so they should compare what they did in detail to find the differences in the procedure.