Measures of Dispersion Flashcards
(5 cards)
1
Q
What are the 4 measures of dispersion
A
Range
Inter quartile range
percentile range
Standard deviation
2
Q
What is standard deviation
A
how much each value deviated from mean on average
3
Q
What is the first calculation for standard deviation
A
Sum of all (x - mean value) squared
divided by
n (all values)
Sqaure root all
4
Q
What is the second calculation for standard deviation
A
Square root all
sum of all x^2
divided by n
take away mean sqaured
5
Q
What is standard deviation not useful for
A
when you have extreme values
