Experimental Design

Experimental Design - Chapter 13 Chapter ExperimentalDesign...

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Chapter 13 Chapter 13 Experimental Design
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Definitions: 1) Observational study - observe outcomes  without imposing any treatment 2) Experiment - actively impose some  treatment in order to observe the response
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I’ve developed a new rabbit food, Hippity Hop. Rabbit Food Makes fur soft & shiny! Increases energy! 100% of daily vitamins & essential oils!
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Can I just make these claims? What must I do to make these claims? Who (what) should I test this on? What do I test? NO Do an experiment Rabbits The type of food
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3)Experimental unit – the single  individual (person, animal, plant, etc.)  to which the different treatments are  assigned 4) Factor – is the explanatory variable 5) Level – a specific value for the factor
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6) Response variable – what you measure 7) Treatment – a specific experimental  condition applied to the units
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I   plan to test my new rabbit food. What are my experimental units? What is my factor? What is the response variable? Rabbits Type of food How well they grow
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Hippity Hop I’ll use my pet rabbit, Lucky! Since Lucky’s coat is shinier & he has more energy, then Hippity Hop is a better rabbit food!
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8) Control group – a group that is used to  compare the factor against; can be a  placebo or the “old” or current item 9) Placebo – a “dummy” treatment that can  have no physical effect
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Old Food Hippity Hop Now I’ll use Lucky & my friend’s rabbit, Flash. Lucky gets Hippity Hop food & Flash gets the old rabbit food. WOW! Lucky is bigger & shinier so Hippity Hop is better!
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Old Food Hippity Hop The first five rabbits that I catch will get Hippity Hop food and the remaining five will get the old food. The Hippity Hop rabbits have scored higher so it’s the better food!
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Old Food Hippity Hop Number the rabbits from 1 – 10. Place the numbers in a hat. 1 2 3 4 5 6 7 8 9 10 The first five numbers pulled from the hat will be the rabbits that get Hippity Hop food. I evaluated the rabbits & found that the rabbits eating Hippity Hop are better than the old food!
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Experimental Design - Chapter 13 Chapter ExperimentalDesign...

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