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