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October 18, 2010 Notes - True and Sample Populations True...

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BS 158H Notes 18 October 2010 *If your hypotheis is true, and you do an expiriment, then the pridiction should occur, or else the prediction is false. (possibly great exam question) The question would ask for hypothesis, experiment, prediciton, etc. Features of a Control Controls o Held constant o Control group Do not receive the treatments Treatments o Treatment variables o We are maniupalting the input or variables o Treatment groups Groups in which treatments are enacted Responses o Dependant variables o Changes as a result of the treatmentss Replication o An experiments must be repeatable o True vs. Pseudo-replication o Try to avoid pseudo-replicaiton Changes in the controlled vairables o Replicates-repeated unit in an experiment
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Unformatted text preview: True and Sample Populations True Population vs. Sample Population o Statistical features of true population may not be known o Sample estimates featuers of true populatin Impractical to measure every individual o Time and resource constraints Why a random sample? o Random sample is unbiased estimator of population features What is random o Random doesn’t always look random o Haphazardness is not random o Random number generators Types of Data Discrete vs. Continuous Data Discrete categories, no ‘in betweens’ (e.g., high, medium, low) Continuous – along a continuum, always ‘inbetweens’ (e.g, time, length, mass)...
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