Measures of Location and Spread Flashcards
1
Q
mode
A
Occurs most often
2
Q
Median
A
The middle value when the data values are put in order
3
Q
How to calculate the mean normally?
A
x̄ = Σx /n
(The mean = The sum of the data values / the number of data values)
4
Q
How to calculate the mean when data is given in a cumulative frequency table?
A
x̄ = Σxf / Σf
(The mean = the sum of the products of the data values and their frequencies / the sum of the frequencies)
5
Q
What is Variance?
A
Shows how spread out the data is
6
Q
Basic Formula of Variance
A
σ² = (Σx²/n) - (Σx/n)²
7
Q
Sxx =
A
= Σx² - [ (Σx)² /n ]
8
Q
Standard deviation
A
Given in formula book
9
Q
Mean coding
A
x̄ = (ȳ - b) /a
10
Q
Standard deviation coding
A
σx = σy / |a|
