Flashcards in Chapter 2 Deck (13)
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1
Central Tendency
Typical or most representative value of a group of scores
Middle of the group of scores
Mean, median, mode
2
Mean
Average of a group of scores
Scores added up and divided by the number of scores
Balancing point
Used with equal-interval variables
3
Mode
Value with the greatest frequency in a distribution
Most common single value in a distribution
Poor projection of a value because not many aspects of the distribution are reflected
Used with normal variables
4
Median
Middle score when all the scores in a distribution are arranged from lowest to highest
Can be used to deemphasize an extreme number
Used
5
Outlier
Score with an extreme value (very high or very low) in relation to the other scores in the distribution
6
Variability
How spread out scores in a distribution are
Variation
Less variability are scores close to mean and vice versa
7
Variance
Measure of how spread out a set of scores are
Average of the squared deviations from the mean
8
Deviation Score
Score - Mean
9
Squared Deviation Score
Square of the difference between a score and the mean
10
Sum of the Squared Deviation
Total of each score's squared difference from the mean
11
Standard Deviation
Square root of the average of the squared deviations from the mean
Roughly, the SD is the average amount that scores differ from the mean
Square root of the variance
12
Computational Formula
Shortcut to simplify figuring
13
