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Measurements of central tendency, Yorly Tatiana Barbosa Hernández, image,…
Measurements of central tendency
Average
Data presented multiples times
The formula used is:
Arithmetic average
The formula used is:
Sum of all numbers /Quantity of numbers
Representative value of all data
Grouped data
Two columns are added
Xi
Fi*Xi
Formula used to calculate xi
Ultimate formula
Mode
Most frequently repeated item
Mode for grouped data
The formula used is:
Meaning of the variables
Δ1: difference between the highest frequency and the previous frecuency
Δ2: difference between the highest frequency and the later frecuency
Lri: Lower real limit
Vi: Interval value
It is classified in:
Bimodality
Multimodality
Unimodality
Median
Center datum for data sorted in ascending or descending order
The number of data is odd
Arithmetic average of the central data
The number of data is odd
Formula used for
n
odd
Formula used for
n
even
Median for grouped data
The formula used is:
Meaning of the variables
∑F: Sum of the frecuencies that are above the marked frecuency
Vi: Interval value
N: Data number
Fm: Median frecuency
Lri: Lower real limit
Yorly Tatiana Barbosa Hernández
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