STATS EXAM, Chapter 3 (Quantitative Variables), Chapter 2 (Categorical Variables)

What is a pareto plot?

A bar chart that has been put in order. This specific graphic must go in order of most common bar to least common bar.

What is a mosaic plot?

A bivariate categorical display that allows us to analysis an association between two variables.

What is a bar chart?

A categorical univariate display of data that puts the counts in to bins that look like bars. The bars have no order and can be ordered any way we want.

What is a categorical variable?

A categorical variable is any variable that can put in to groups. Examples include gender, class in school and color

What is a histogram?

A univariate display of quantitative data that has been put in to bins. Changing the bin widths will change how the histogram looks.

What is an identifier variable?

An identifier variable only identifies. It MUST be unique. It can not repeat even if we collect more data. Examples include social security number, student ID and drivers license number.

What is a quantitative variable?

Quantitative variables are actual real numbers. This means if it is 2 it actually means 2 something. Examples include age, weight, and GPA.

What three things must we analyze when talking about a histogram?

Shape, center and spread (Be able to write full sentences on each)

What is the best measure of center for skewed data?

The median. It is not impacted by outliers.