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Lecture 3

# Lecture 3 - Scores.docx

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School
Western University
Department
Health Sciences
Course
Health Sciences 2801A/B
Professor
Christopher Lee
Semester
Fall

Description
Lecture 2: Scores September 27, 2013 o Observed Score – is the value obtained directly from a measurement process (e.g., 38 C) Centred Score – is the value obtained by subtracting the mean from an observed score (e.g., 38-37 = 1 C) – all add up to 0 Case 2.1 Donut Fat Centred Fat Squared Centred Fat Apple Fritter 11 - 1.8 3.24 Blueberry 8 -4.8 23.04 Blueberry Glazed 15 2.2 4.84 Chocolate Dip 8 -4.8 23.04 Chocolate Glazed 10 -2.8 7.84 Dutchie 10 -2.8 7.84 Old Fashion Plain 19 6.2 38.44 Sour Cream Plain 17 4.2 17.64 Strawberry 7 -5.8 33.64 Walnut Crunch 23 10.2 104.04 Mean 12.8 0.0 Sum of Squares (SS) 263.60 Variance (s ) 29.29  263.60 (10-1) Standard Deviation (s) 5.41 Degrees of Freedom Variance – is equal to the sum of squares divided by its degrees of freedom 2 2 s = SS = ΣC df N-1 Sum of Products (SP) – is a basic measure of relationship between two variables Case 2.2 – Sum of Products Observed Centred Height Metacarpal Height Metacarpal 163 42 -2 -3 6 163 43 -3
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