Introduction to StatsHonors Analysis

Data Analysis

• Individuals: Objects described by a set of data. (Ex: People, animals, things)

• Variable: Any characteristic of an individual. Can take different values for different individuals.

• Categorical Variable: Places individual into one of several groups or categories.

• Quantitative Variable: Numerical data (for which it makes sense to make mathematical calculations)

Frequency Table

Titanic Passengers By Ticket Class

Relative Frequency Table (percents)

Titanic Passengers By Ticket Class

BAR CHART

People on the Titanic (By Ticket Class)

Pie Chart

Titanic Passengers By Ticket Class

What’s Wrong With This Graph?

What’s Wrong With This Graph?

Two-Way Tables (Contingency Tables)

• Compares two kinds of data (in this case, survival and ticket class)

Marginal Distributions

Conditional Distributions

• Calculate row or column percentages

Conditional Distributions

• Calculate row or column percentages

Segmented Bar Chart

Survival By Class

Comparative Bar Chart

Ideal Distance from College to Home

Why is this not an ideal display???

Comparative Bar Chart

Ideal Distance from College to Home

Why is this a better display?

Stemplot

Back-to-Back Stemplot

Dot Plot

Histogram