Chapter 4- Exploring Data: Variability

Question 1

Range

Answer 1

Highest score minus the lowest

Question 2

Want range to be variable?

Answer 2

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.

Question 3

What should you use to measure variability??

Answer 3

STANDARD DEVIATION

Question 4

STANDARD deviation

Answer 4

Measure of the dispersion of scores around the mean

Question 5

S

Answer 5

Samples SD

Question 6

Weird o

Answer 6

Lower case sigma

Populations SD

Question 7

S ish

Answer 7

S with a hat. Estimate of populations far is variability

Question 8

SD

Answer 8

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

Question 9

X - X bar

Answer 9

Data point minus the mean

Question 10

Deviation

Answer 10

How much it deviates

Question 11

Dev. Squared

Answer 11

Square em!!

Question 12

Spacers

Answer 12

Called whispers on bar graphs