# Lec01 - Scientific Method Make observations Form a...

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Scientific Method Make observations Form a hypothesis Make predictions Test the hypothesis Rinse and repeat Shoals Marine Laboratory

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Science and Life in General Observation Analysis Understanding Judgment Action
Uncertainty Will it rain tomorrow? Will Ichiro Suzuki get a hit at his next  at bat? Will California condors go extinct? Are PCBs a health problem in the  Hudson River? Is there enough water being left in the  Klamath River to support the fish?

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Statistical Methods Provide a logical objective structure for  addressing questions that are inherently  uncertain.
General Topics Data  Trend and Variation Hypothesis Testing Statistical Modeling Applied Statistical Theory Computational Methods

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Splus / R A statistical computing environment
Collecting Data Sex (M,F) Head Circumference (cm) Foot Size (cm)

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A Little Math Build on basic  statistical concepts Mean Variance Correlation Probability Build conceptual  models Make predictions
Which of the following is a  measure of central tendency? A: Mean B: Variance C: Median D: Mode E: Interquartile range There may be more than one correct answer.

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Intercept and Slope
Determining the slope of a line

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Leaves Data  132 points, leaf length mm leaves.txt 61 75 79 68 79 66 73 52 72 …
The Population of Leaf Lengths

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Summary Statistics How useful are they in describing the  system? In what sense are they optimal (that is  are they the best descriptors)?

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Find theta that minimizes the  sum of squares
Derivative with respect to  theta (slope = 0)

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• Fall '07
• SULLIVAN,P.
• Ichiro Suzuki, Population · Elementary, whitefish n whitefish, Testing Statistical Modeling Applied Statistical Theory Computational Methods

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Lec01 - Scientific Method Make observations Form a...

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