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6 Cards in this Set

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Central Tendency
A single score from the middle of the distribution that represents the whole data set
3 measures of CT
Mean
Median
Mode
Mean
Arithmetic Average
Most popular measure of CT
Properties of means
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
Median
The 50th percentile
Put the scores in order first (low-high) to compute
Mode
Most frequently occuring score
Can be uni- or bimodal
Can be symmetrical, positively skewed or negatively skewed