6.4 Measures of Dispersion Flashcards
1
Q
Range
A
The difference between the largest and the smallest value
2
Q
What is the formula for range?
A
Max - min
3
Q
Quartiles
A
Separate the data into four equal parts (quarters)
4
Q
First/lower quartile
A
Value one-quarter of the way into the data (Q1)
5
Q
Secon quartile/median
A
The middle value of the data set (Q2)
6
Q
Third/upper quartile
A
Value is three-quarters of the way into the data (Q3)
7
Q
Interquartile range
A
The difference between the upper and lower quartiles
8
Q
What is the formula for interquartile range?
A
IQR = Q3 - Q1
9
Q
Box and Whisker Plot (Box Plot)
A
Graphical representation of a five statistical summary
10
Q
Outlier
A
An extreme value at least 1.5x IQR above the third quartile or below the first quartile
11
Q
What are the formulas for figuring out outliers?
A
Q3 + 1.5IQR or Q1 - 1.5IQR
