Flashcards in Chapter 4- Exploring Data: Variability Deck (12):

1

## Range

### Highest score minus the lowest

2

## Want range to be variable?

###
NO.

If the range is not very variable, it means the data hasn't changed that much. You can say with certainty. If the gap is huge it's variable. If it's not it is invariable.

3

## What should you use to measure variability??

### STANDARD DEVIATION

4

## STANDARD deviation

### Measure of the dispersion of scores around the mean

5

## S

### Samples SD

6

## Weird o

###
Lower case sigma

Populations SD

7

## S ish

### S with a hat. Estimate of populations far is variability

8

## SD

###
Raw scores minus the mean of the distribution, whether the distribution is a sample or pop.

If raw is greater- positive deviation scores

If raw is lower- neg. Ds

Equal to- deviation score of zero

9

## X - X bar

### Data point minus the mean

10

## Deviation

### How much it deviates

11

## Dev. Squared

### Square em!!

12