M4: Boxplots and Quartiles Flashcards
1
Q
Quartiles
A
Divide the data set into 4 quarters
a) Q1 - 25%
b) Q2 - 50%
c) Q3 - 75%
2
Q
How to calculate Q1 and Q3
A
Median of the lower/upper half of the data
3
Q
What measures of tendency/spread are affected by outliers and skewness?
A
Yes
a) Mean
b) Range
c) Std. deviation
No
a) IQR
b) Median
4
Q
Interquartile Range
A
Q3 - Q1
5
Q
Summary of position numbers
A
Minimum
Q1
Median
Q3
Maximum
6
Q
Boxplots components
A
a) Box (IQR) = 50% of central data
b) Whiskers = Min / Max
c) Asterisks = Outliers
7
Q
Stem and Leaf Display
A
Cumulative count (Back/Forth)
Stem
Leaf unit (0.1 / 1 / 10)
8
Q
Median position formula
A
(n+1)/2
