marcel conducts an experiment to test which stain remover works best on mustard stains. he wants to make sure that he
does not make mistakes and has correct data in his experiment.
what should marcel do to make sure that his data are correct?

Repeat the experiment several times with the same variable and constants.  

Explanation:

The experimental procedure should be performed many times so as to determine the effect of the stain remover on mustard stain in different conditions and while using different variables such as water and type of machine used. This will tell how useful the stain remover in all conditions provided to check the accuracy of the stain remover.

i don,t know so just answer mine

idk what is it? is this a question that you know the answer or u dont