A hypothesis is a conclusion drawn before all of the facts are established and tentatively accepted as a basis for further investigation.
A conclusion is the final operation in the scientific method. It is a decision made about the validity of the hypothesis on the basis of experimental evidence. Observation is the first operation in the scientific method. Observation is the noting of a specific phenomenon leading to the formulation of a hypothesis. Perception is the organization, identification, and interpretation of sensory information. An assumption is an idea that is not subjected to logical study.
