In class the sit up lab helped show controlled variables. They should've gotten the same everything except for one being a girl and one being a boy to be an accurate and controlled experiment.
To be able to have a problem you must make an observation. There are qualitative and quantitative observations. Qualitative observations are observations using one or more of your five senses. Quantitative observations are factual measured observations.
The scientific method is a problem solving method it involves 5 or 6 steps first step being to find a problem and ask a question. Second step is to form a testable question called a hypothesis.