1. Standard Deviation Calculate the mean Given a Data Set 12, 8, 7, 14, 4
1st slide
Calculate the mean
Given a Data Set
12, 8, 7, 14, 4
Mean = ( ) ÷ 5
= 9
The standard deviation is a measure of the mean spread of the data from the mean.
How far is each data value from the mean?
( ) ÷ 5 = 12.8
Square to remove the negatives
Square root 12.8 = 3.58 25 1 9 4
Std Dev = 3.58 4 7 14 12 8 -2 -1 3 5 -5
Average =
Sum divided by how many values
Calculator function
Square root to ‘undo’ the squared