Elementary Statistics - Unit 1
bar graph
a graph that uses vertical bars to show comparisons among two or more nominal or ordinal items
frequency distribution
an arrangement of data that indicates how often a particular score or observation occurs
Frequency (symbol)
f
Number in sample (symbol)
n
proportion formula
p=f/N
Sample Variance Formula
s^2= SS/n-1
Sum of Squares (SS)
sum of squared deviations from the mean
Histogram
A graph of vertical bars representing the frequency distribution of a set of interval or ratio data
Sample Mean Formula
M = ∑X/ n
Number in population (symbol)
N
Population Variance formula
SS/N
deviation from the mean formula
Score minus the Mean
Sum of All Values
Sigma or Summation Notation
Standard Deviation (population) formula
Square root of the population variance
Standard Deviation (sample) formula
Square root of the sample variance
population mean symbol
The population mean symbol is μ.
Sample Mean Symbol, Definition
The sample mean symbol is x̄, pronounced "x bar" or M.
Population Mean Formula
μ = ∑X / N