Can you paraphrase this please Thank you No a positive corr

Can you paraphrase this please ! Thank you!

\"No, a positive correlation between output and training is not convincing evidence that training improves productivity unless the amount of training is randomly assigned. The many factors listed in parts (b) and (c) can contribute to finding a positive correlation between output and training even if job training does not improve worker productivity\"

Solution

A positive correlation between output and training can’t be consider as a convincing evidence as this has not proved that training improves productivity unless the amount of training is randomly assigned. Out of many factors, parts (b) and (c) listed can contribute to finding a positive correlation between output and training even if job training does not improve worker productivity,