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Scientific Method

Scientific Method. Water vs Sprite Experiment. Steps of the scientific method. Observe: the environment Question: Recognize there is a problem and state it in question form Hypothesis - take an educated guess as to the answer Predict what we will see if we are right or wrong

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Scientific Method

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  1. Scientific Method Water vs Sprite Experiment

  2. Steps of the scientific method • Observe: the environment • Question: Recognize there is a problem and state it in question form • Hypothesis- take an educated guess as to the answer • Predict what we will see if we are right or wrong • Test the predictions • Draw a conclusion

  3. Write the template in yr NB • Observe: • Question: • Hypothesize: • Predict: • Test/Experiment • Draw Conclusion:

  4. Observe • X-mas trees, how do we keep them alive longer?

  5. Question • I wonder if that will work for simple plants too, like a bean plant

  6. Hypothesize • I think it will help it grow faster

  7. Predict • If it grows faster, it will be taller than the control , within the next 2 weeks

  8. Test/Experiment • Get beans • Get cups • Label them: • Give sprite • Watch and measure growth- every other day

  9. Draw Conclusion • Either it did grow faster • or it did not, • or still grew at the same rate. • Which means……

  10. What makes a hypothesis valid? • It must be able to be able to be tested • Creationism: Not considered a valid hypothesis • Evolution: We evolved from a primate-like ancestor.

  11. What makes an experiment valid? • Observe: Many reports of cancer in people who live down the valley

  12. Question: It’s the oldest part of Belleville, and its by the polluted Passaic River

  13. Hypothesis: Maybe the water supply is contaminated by river water

  14. Predict: If this is true, I will find 10 or more families down the valley, where someone has cancer

  15. Test: I sent all the families down the valley a survey to fill out and they all sent it back

  16. Conclusion: 10 out of 500 families there have people in the home suffering from Cancer, so our hypothesis is right

  17. What’s wrong with this experiment? • Experimental vs. Control • Control: other areas of Belleville • Variables? • Type of Water, food, radon, age- old/young…. • You have to keep everything the same and test 1 thing at a time

  18. There are 2 types of variables • Independent variable: (manipulated variable) stands alone • Dependent variable: (responding variable) responds/ follows/ is expected to follow the independent variable • In the Sprite vs. water…what are we adding/controlling…. • What do we expect to change because of that?....

  19. Why do we need a control? • It validates the experiment… • It establishes what is normal, or what would have happened anyway…. • For comparison…

  20. When testing medication, what is the control? • Placebo • Hair re-growth pill • Results: 10 men (5 got placebo and 5 got the pill) • What if 4 pill and 0 placebo re-grew hair, does it work? • What about if… 4 pill and 2 placebo re-grew hair • What about if 2 placebo and 2 pill re-grew hair?

  21. For our Sprite experiment… • How many variables should we have? • How many variables should stay the same? List them • What is the independent or manipulated variable? • What is the dependent or responding variable?

  22. Observe: • Question: • Hypothesize: • Predict: • Test/Experiment • Draw Conclusion:

  23. Test/Experiment • Get beans- • Get cups • Label them: • Give sprite • Put them aside • Watch and measure growth- every other day

  24. Inference/ Observation • What is the difference? • Look at the following pictures, make the inference or observation….

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