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