Rannan wants to perform a scientific experiment. He writes out a systematic process that involves him making observations and then forming his opinion about those observations. He then collects his opinions together and uses them to show that his findings are supported by evidence. In what way did Rannan make an error in his scientific process?

He should not use a systemic process.
He should not use his opinions as evidence.
He should not make observations.
He should not use multiple steps in his process.