Chapter 3: Measures of Location Flashcards
1
Q
Mean
A
The average of all values
Pro: takes every observation into account
Con: swayed by outliers
Use: normal interval/ratio data
2
Q
Median
A
The middlemost value when data are in ascending order
Pro: not impacted by extreme values
Use: skewed or ordinal data
AKA: 50th percentile
3
Q
Mode
A
Most frequently occurring value
Unimodal = 1 mode
Bimodal = 2 modes
Multimodal = 3 modes
Use: nominal data
4
Q
Index
A
an observation’s position within the data set
5
Q
Percentile
A
What percent of the data fall at or below the number?
6
Q
Quartiles
A
Q1 = 25th percentile
Q2 = 50th percentile
Q3 = 75th percentile
