Chapter 4- Exploring Data: Variability Flashcards Preview

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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

Spacers

Called whispers on bar graphs