1 Scientific Methods and Statistics

1 Scientific Methods and Statistics - Scientific Method and...

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Scientific Method and Statistics
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Scientific Method Observation: Collect and organize information Hypothesis: Explanation(s) must be testable Experimentation: (a) control vs. experimental variable Control: a variable that remains unchanged; its held constant in order to verify or measure the behavior of the variables against it Experimental: this is a factor or variable that is deliberately manipulated or changed (depend’t vs. independ’t) ( b) replication of experiment (c) statistical evaluation Reevaluation Conclusion ------?-------> theory
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Statistical Evaluation and the Chi Square Analysis (X 2 ) Null hypothesis = assumes no real difference between measured (i.e., observed) and expected values, therefore How good is the “fit” between these values If the fit is imperfect, how much deviation is allowed Chi Square Analysis = evaluation of deviation and sample size Value used to evaluate deviation and expectation due to chance X 2 = total of (observed - expected) 2 expected
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Statistical Evaluations Null Hypothesis: Assumption that data will fit into a given pattern or ratio Should be no difference between observed values (ratios) and
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1 Scientific Methods and Statistics - Scientific Method and...

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