Scientific Method

Science is an organized way of using evidence to learn about the natural world

Observations using the senses to collect evidence or data


Quantitative Data – Measurements or numbers

Qualitative Data – observations not easily measured

Inference – logical interpretation based on prior knowledge

Hypothesis – A possible explanation for given observations (an answer to a scientific problem)

Experimental design

          1. State the problem

          2. Form a hypothesis

          3. Set up a controlled experiment (must be repeatable)

                    Change only one variable

                    Independent variable – Manipulated variable – that which is deliberately changed

                    Dependant variable Responding variable – that which is observed to change in response to or because of changes in the Independent/manipulated variable

4. Record and analyze results - keep written records and show your work

5. Draw a conclusion – based on the data and observations was the hypothesis supported or not

 Hypothesis can generally be stated “IF (independent variable) Then (Dependent Variable)

Theory – A well tested explanation for a group of observations

Law – A theory that has been tested many times and is accepted as valid