Chap 3 Measures of Variability Flashcards Preview

STATS > Chap 3 Measures of Variability > Flashcards

Flashcards in Chap 3 Measures of Variability Deck (15):
1

Define Boxplot

A graphical representation of the distribution of the scores on a variable that includes the range, the median, and the interquartile range.

2

Define Interquartile Range (IQR)

The difference b/w the 75th (3rd q) percentile and the 25th(1st q) percentile scores in a distribution.

3

Define Range

The difference b/w the largest score and the smallest score of a distribution.

4

Define Squared deviation

The difference b/w an individual score in a distribution and the mean for the distribution, squared.

5

Define: Sum of squared deviations (sum of squares)

The sum of each squared deviation for all of the cases in the sample

6

Define Variance

The sum of the squared deviations divided by the number of cases in the population, or by the number of cases minus one in the sample

7

What does this symbol mean μ ?

The population mean

8

What does this symbol mean X?

An individual score in a distribution

9

What does this symbol mean s2?

The sample variance

10

What does this symbol mean s?

The sample standard deviation

11

What does this symbol mean σ

The population standard deviation

12

What does this symbol mean σ2

The population variance

13

What does this symbol mean SS

The sum of squares, or sum of squared deviations

14

What does this symbol mean n

The number of cases in the sample

15

What does this symbol mean N

The number of cases in a population