Unit 5-2

Unit 5-2 - Chapter 2 Chapter 2 Experimental Design...

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Unformatted text preview: Chapter 2 Chapter 2 Experimental Design Definitions: 1) Observational study - observe outcomes without imposing any treatment 2) Experiment - actively impose some treatment in order to observe the response I’ve developed a new rabbit food, Hippity Hop. Rabbit Food Makes fur soft & shiny! Increases energy! 100% of daily vitamins & essential oils! 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 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 6) Response variable – what you measure 7) Treatment – a specific experimental condition applied to the units 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 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! 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 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! 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! 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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This note was uploaded on 12/09/2011 for the course STATS 221 taught by Professor Nielson during the Fall '10 term at BYU.

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Unit 5-2 - Chapter 2 Chapter 2 Experimental Design...

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