Answer:
One morning, a man was fishing in on a river. The Sun shone and the man. Everything was very quiet and peaceful. The man sat on the river and waited patiently for several hours. When suddenly he felt something pulling the fishing line. He stood up quickly and pulled the fishing line. At first, the man didn't know what to do. Then, fishing line. It snapped. The poor man was so disappointed that he packed his all thing and went home.
Since this type of scientific method will utilize experimentation, the two varibles that would be part of the procedure is the different detergents, thus can specifically be the content, amount and acting agent as the covariables of the independent variable, detergents. And the other is the cotton fabric as the dependent variable.
The two varibles that aren't involve is the color of the cotton fabric since the experiment has not specified any but clearly specifies cotton fabric and the other will be other types of fabric.
The critical stage in an interview is having eye contact at all times..
OR....
Be confident and don't doubt yourself and always just stay calm and collective and everything will go extremely well