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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

Definitional Formula

Equation for a statistical procedure directly showing the meaning of the procedure