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Experimental Design

Experimental Design

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Experimental Design

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  1. Experimental Design 8th Grade Science Objective: Design a controlled scientific experiment S1, C2, PO2

  2. What careers or professions use the Scientific Method? • scientists • city water/ sewer/ landfills/etc. • medical professions • research and development of products • ??

  3. The Bad News?Test results are in…The diagnosis? You have blah-blah disease.

  4. The Good News? There might be a cure but the treatment is still experimental. • You have to participate in a clinical study to determine the effectiveness of the treatment.

  5. Problem • Does Blahcure relieve the symptoms of Blah-Blah disease?

  6. Hypothesis • The more Blahcure given/taken, the less evident the symptoms will be.

  7. Independent Variable • medication

  8. Dependent Variable • Measure the symptoms of the disease • Check to see if patient feels better

  9. Constants • Same disease & level of sickness • Age of participant • Same health conditions of diet, exercise, vitamins, etc. • Habits such as smoking or drinking • Same exam

  10. Experimental Group • Different amounts of the medication

  11. Treatment Description

  12. Control Group • It represents what is Normal. • Doesn’t get any treatment. • Give them aplacebo (fake pill).

  13. 2. Problem • Does the amount of fertilizer given to a plant affect how tall the plant will grow?

  14. Hypothesis • The more fertilizer used, the taller the plant will grow.

  15. Independent Variable • fertilizer

  16. Dependent Variable • Height of the plant

  17. Constant Variables • Sunlight • Climate • Water • Soil (sandy, peat moss, etc)

  18. Treatment Description

  19. Control Group • It represents what is Normal. • So what is “normal?”. • Plain dirt…NORMAL SOIL.

  20. Experimental Group • Different amounts of fertilizer.

  21. 3. Problem • Does the type of tennis shoe effect the number of shin splints and knee problems for runners?

  22. Hypothesis • The __________ (kind of shoe) will reduce the number of shin splints/knee problems the runner will have.

  23. Independent Variable • Kinds of shoes

  24. Dependent Variable • Number of shin splints and knee problems runners have.