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Types of Variables AP Statistics 06-07 Dobson

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Review of Terms Individual: The objects described by a set of data, individuals may be people, animals or things Ex: Students in an AP Statistics class Variable: any characteristic of an individual. A variable can take on different values for different individuals Ex: Heights of individuals: Student #1: 5’ 5” Student #2: 5’ 7” Student #3: 5’ 2”

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**Two Types of Variables Quantitative:**

Numeric value that it makes sense to do arithmetic operations (+, -, x, /) Finding an arithmetic “average” makes sense EX: Height Weight Age Income Test Scores

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**Types of Variables Categorical**

Records which of several groups or categories to which an individual belongs If there are only 2 possible categories, the variable is called binary Ex: Gender Race SES (socio-economic status) Marital status

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Caution!!! Most quantitative variables can be asked in such a way as to make them a categorical variable. Ex: Age: Please choose the category that describes how old you are OVER 80

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**Determine if the variable is Quantitative or Categorical**

Height Armspan Whether or not the individual went to sleep before 12:00am Month of birth Distance from home Whether the individual has a cell phone How many messages a person has sent in the last 24 hours The age of a bride on her wedding day Whether the bride is older, younger, or the same age as the groom in a wedding couple The number of letters in a person’s last name Check your answers on the next slide

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**Quantitative Variables**

Height Armspan Distance from home How many messages a person has sent in the last 24 hours The age of a bride on her wedding day The number of letters in a person’s last name Categorical Whether or not the individual went to sleep before 12:00am Month of birth Whether the individual has a cell phone Whether the bride is older, younger, or the same age as the groom in a wedding couple

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**Further Resources Practice of Statistics: pg 4-7 Homework Assignment:**

1-1: Problem #1a-p :

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Exploring Data Individuals and Variables Categorical and Quantitative Variables.

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