Experimental Design

Experimental Design - white(control group Track prey...

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Experimental Design Obtain 500 dogs of various breeds from local shelters. Have vet weed out the 200 dogs with the most fleas. Randomly assign individuals to 2 groups. Board the dogs in identical environments and treat them the same except that one group gets to wear the King collar and the other group does not After 2 wks. The dogs are examined by a vet for fleas.
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Results: the dogs wearing the King collars were virtually free of fleas after the 2 wk period compared to the dogs without the collars which had about the same number of fleas as when the experiment began
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Second Example Observation: polar bears are white, you wonder why this is so Hypotheses:
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Prediction: polar bears which are white will capture more prey than those which are dark Experimental Design: spray paint 5 polar bears dark(experimental Group)/leave 5
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Unformatted text preview: white(control group) Track prey capture for 8 weeks Effect of Polar Bear coat color on prey capture Color of Bear White Dark Number of Prey Probability and Statistics • Probability : an attempt to measure and predict the likelihood of an event • Statistics : allow you to evaluate comparisons between experimental and control groups Effect of Polar Bear coat color on prey capture Color of Bear White Dark Mean Number of Prey captured Mean: sum the values, divide by the number of values Statistics • Sample Size : # of observations necessary to have a reliable representation of a population • Confidence Limits : estimates that reflect the reliability of your mean (average) – Probability your sample is similar to other random samples of that population...
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