The Scientific Method

A Scientific Way of Problem Solving

What is the scientific method?A series of steps that

scientists use to logically answer science related questions.

Step 1- Identify the Problem

Recognize the problem and state it as a question.

A rattlesnake will strike its’ prey and let it get away.

The rattlesnake is able to then track its’ prey and find it sometimes many meters away!

Step 2- Gather Info. on the Problem

ResearchObservationDiscover what is already

known about the problem.

Research information about how snakes hunt.

Speak with a zoologist that is an expert on rattlesnakes.

Step 3- State a HypothesisA hypothesis is a

suggested solution (“educated guess”) as to why something happens.

A hypothesis is usually made after careful research.

Develop a well researched answer to your question in step 1

Be prepared to support your answer with the data you gathered

Our HypothesisWe know that

snakes can detect invisible light which allows them to track heat.

Snakes use their tongue to smell.

Our hypothesis is that snakes can smell and track their own venom.

Step 4- Test the HypothesisA hypothesis is tested by

conducting an experiment.A variable is something that

changes in an experiment.1. Independent Variable- the

factor that is manipulated or changed by the scientist.

2. Dependent Variable- the part of the experiment that is effected by the independent variable.

*** Never test more then one variable at a time because it will be difficult to tell which one affected the outcome.

Test whether the venom forms an invisible trail that the snake follows.

Control GroupPart of the experiment

that does not receive the independent variable; used for comparison.

Experimental GroupThe part of an experiment

that receives the independent variable and is then compared to the control group.

We place a rattlesnake in an enclosed area with some mice.

We are looking to see if the snake is able to kill and track only the mouse it has bitten.

Step 5- Record and Analyze Data

Repeat experiment numerous times, same way.

Accurately record all data and observations.

Organize data. (graphs & data tables)

Step 6- State a Conclusion

Explain data and findingsState whether or not your

findings support your hypothesis.