Representation and summary of data—measures of dispersion Flashcards
1
Q
How can the variance of discrete data be calculated?
A
((Σ(x²))/n)-((Σ(x)/n)²)
2
Q
What is the relation of the standard deviation to the variance?
A
It is the square root
3
Q
How is the standard deviation notated?
A
σ
4
Q
What effect does coding with addition have on the standard deviation?
A
None
5
Q
What effect does coding with multiplication have on the standard deviation?
A
If the data is multiplied by n, the standard deviation of the coded data will be n times larger than that of the original data
