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6 Cards in this Set
- Front
- Back
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Central Tendency
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A single score from the middle of the distribution that represents the whole data set
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3 measures of CT
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Mean
Median Mode |
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Mean
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Arithmetic Average
Most popular measure of CT |
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Properties of means
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1. Every score in the data set affects the mean
2. If you add/subtract a constant to each score, you add/subtract that same amount to/from the mean 3. The same is true for multiplication/division 4. The sum of the deviations ALWAYS equals zero 5. The mean is sensitive to outliers |
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Median
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The 50th percentile
Put the scores in order first (low-high) to compute |
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Mode
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Most frequently occuring score
Can be uni- or bimodal Can be symmetrical, positively skewed or negatively skewed |
