SHOWTIME!. STATISTICAL TOOLS IN EVALUATION. DESCRIPTIVE VALUES MEASURES OF VARIABILITY. MEASURES OF CENTRAL TENDENCY. WHEN THE GRAPH OF THE SCORES IS A NORMAL CURVE, THE MODE, MEDIAN, AND MEAN ARE EQUAL THE MEAN IS THE MOST COMMON MEASURE OF CENTRAL TENDENCY
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MEASURES OF VARIABILITY
• CONSIDER TWO GROUPS OF SCORES
GROUP 1 = 9, 5, 1; GROUP 2 = 5, 6, 4
• BOTH HAVE A MEAN AND MEDIAN OF 5 BUT GROUP 2 HAS MUCH MORE HOMOGENEOUS OR SIMILAR SCORES THAN GROUP 1
7, 2, 7, 6, 5, 6, 2
RANGE = HIGHEST SCORE MINUS LOWEST SCORE = 7 - 2 = 5