# 7.1: Line Graphs

Difficulty Level: Basic Created by: CK-12
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### Vocabulary Language: English

TermDefinition
bar chart A bar chart is a graphic display of categorical variables that uses bars to represent the frequency of the count in each category.
broken line graph A broken line graph is a graph that is used to show changes over time. A line is used to join the values but the line has no defined slope.
continuous variables A continuous variable is a variable that takes on any value within the limits of the variable.
data set A collection of these observations of the variable is a data set.
dependent variable The dependent variable is the output variable in an equation or function, commonly represented by $y$ or $f(x)$.
discrete random variables Discrete random variables represent the number of distinct values that can be counted of an event.
independent variable The independent variable is the input variable in an equation or function, commonly represented by $x$.
qualitative variable A qualitative variable is one that cannot be measured numerically but can be placed in a category.
quantitative variable A quantitative variable is a variable that takes on numerical values that represent a measurable quantity. Examples of quantitative variables are the height of students or the population of a city.
variable In statistics, a variable is simply a characteristic that is being studied.

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