Measures of Central Tendency Flashcards
Most commonly referred to as the average
Mean
Really good when the data is fairly close together.
Most commonly used.
Mean
is the sum of all values of X in the population.
∑ x
The Greek letter mu, μ – Represents a
Population Mean
read as “ x-bar – Represents a Sample Mean
X bar
the middle entry in an ordered list. There are as many data points above it as below it.
median
The is the most frequent number in a data set.
Good when the value of the number is the most important information (e.g. shoe size).
Only choice with categorical data.
mode
Values distant from the majority of the data.
The median is often a better measure of central tendency than the mean for small data sets that contain…
Outliers
a measure of how data points vary from the mean.
Variance
measure of the distribution of statistical data.
standard deviation
