AP Statistics: Bar Graphs, Pie Charts, Two-Way Tables and Relationships between Categorical Variables

Individuals

Obiects described by a set of People. Can be ppl, Objects, animals; anything we want to draw conclusions ab

Variable

Any characteristic of an individual that can be assigned a # or category. Can take diff values for diff. ppl

Distribution

Tells us what value the variable takes and how often it does so

Qualitative/Categorical

Data that can be placed into categories (non numerical)

Quantitative (Measurement)

Variable that can assume a range of numerical values

Discrete Variable

Variable w/ a finite # of values that the answer can assume

Continuous Variable

Variable w/ an infinite # of values that answer can assume,

Frequency Table

Exact values of individuals and how often they appear

Relative Frequency Table

Proportion / Percent of individuals having each value

To make either kind

Tally the # of times the variable takes each value

Frequency table purpose

Summarize a variable distribution w/#'s. To display clearly a graph is sufficient