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Experimental Design

Experimental Design. Testable Question. After and observation a question is generated. A good question is specific and uses what and how . Leads readers into the experiment Example : How high would a rose plant grow if the amount of water varied?. Hypothesis. If….then…

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Experimental Design

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  1. Experimental Design

  2. Testable Question • After and observation a question is generated. • A good question is specific and uses what and how. • Leads readers into the experiment • Example: How high would a rose plant grow if the amount of water varied?

  3. Hypothesis • If….then… • NOT just an “educated guess”. • Very specific regarding details (amounts, units, time, number of trails…) • Eg) If 10mL of water is added to rose plant A and 20mL of water is added to rose plant B, then rose plant A will grow taller than rose plant B. • Can you identify the variables (IDV,DV)?

  4. Variables • Independent Variable (IDV): the variable that is changed/manipulated by the experimenter. • Dependent Variable (DV): the variable that changes as a result of what the experimenter changes (the variable that is measured) • Controls: constant variables – stay the same to ensure your experiment changes are due to the IDV. • Flower Example: • IDV:I am changing the amount of water • DV: I am measuring the height • Controls: same type of rose plant, type of water, time of day, amount of light ….

  5. Results • Quantative: numerical data • Qualatative: Observational data • Organize all data in a chart by variables • Concise and neat

  6. Graph • LINE or Scatterplots in science (mostly) TITLE (should list both variables) Key DV (units) Label Axis and equal spacing IDV (units)

  7. Conclusion • ResultsSUPPORTor DO NOT SUPPORTyour hypothesis and why – refer back to your data. • Discuss results/analyze the data – use the numbers and graph to support your interpretation • Discuss bias or errors – what could have happened that could explain your results, besides your fantastic lab.

  8. Scientific Law: accepted as true by all • Law of gravity • Scientific Theory: An idea that is supported by lots of data but not necessarily accepted by all as true. • Evolution

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