Scientific Method A process to solve a problem. State the problem.

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Presentation transcript:

Scientific Method A process to solve a problem. State the problem. People Get Happy Eating Oreo Cookies State the problem. 2. Gather information about problem. 3. Hypothesis: educated guess based on research- answer to problem. 4. Experiment: test the hypothesis, make observations. 5. Conclusion: discussion- is the hypothesis correct? Explain your reasoning.

Designing Experiments Manipulated variable- what causes the change. * variable that the scientist changes Responding variable- this is expected to change as the independent variable changes. Constant- does not change in an experiment. Control Group- a group used as a standard of comparison. (No experiment is done to the control group) http://www.youtube.com/watch?v=Hxbz656Euyw

Making Conclusions from Experiments Scientific Theory- a well-tested idea that explains and connects a wide range of observations. * scientists need to get more information and observations before a theory can become a law. Scientific Law- a statement that describes what scientists expect to happen every time under a particular set of conditions. Ex: Gravity exists on Earth, on other planets, and out in space

Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer decides to check this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with water. After 3 days of "treatment" there is no change in the appearance of the green slime on either side of the shower. What is the problem? What is the control group? What is the manipulated variable? What is the responding variable? What should Homer’s conclusion be? Shower covered in green slime Half sprayed with water Coconut juice Amount of green slime Coconut juice does not remove green slime

Krusty was told that a certain itching powder was the newest best thing on the market, it even claims to cause 50% longer lasting itches. Interested in this product, he buys the itching powder and compares it to his usual product. One test subject (A) is sprinkled with the original itching powder, and another test subject (B) was sprinkled with the Experimental itching powder. Subject A reported having itches for 30 minutes. Subject B reported to have itches for 45 minutes. 6. What is the Control Group? 7. What is the Manipulated Variable? 8. What is the Responding Variable? 9. Explain whether the data supports the advertisements claims about its product. Test subject A New Itching Powder Longer lasting itches The new itching powder causes itches to last 50% longer