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Constant: A constant is any characteristics, number, or quantity that can be measured or counted. Its value cannot be changed.

Variable: A variable is any characteristics, number, or quantity that can be measured or counted. Its value may change over times.

Types of Variable: There are 2 types of variable. They are:

1. Qualitative.
2. Quantitative.

Qualitative variable: A qualitative variable, also called a categorical variable, are variables that are not numerical. It describes data that fits into categories.
Examples:
•        clothing size (i.e. small, medium, large, extra large)
•        attitudes (i.e. strongly agree, agree, disagree, strongly disagree)
•        Eye colors (variables include: blue, green, brown, hazel)
•        Class in college (e.g. freshman, sophomore, junior, senior).
•        Party affiliation (e.g. Republican, Democrat, Independent).
•        Type of pet owned (e.g. dog, cat, rodent, fish).
•        Favorite author (e.g. Stephen King, James Patterson, Charles Dickens).
•        Preferred airline (e.g. Southwest, Virgin, Quantas).
•        Hair color (e.g. blond, brunette, black).
•        Your race (e.g. Asian, Latino, black).
•        Types of hats (e.g. sombrero, beanie, fedora).

Quantitative variable: Quantitative variables are that which can be measured on a numeric or quantitative scale.
Quantitative variable are 2 types. They are:
1. Discrete. (Integer only)
2. Continuous. (Integer or Fraction)
Examples:
• High school Grade Point Average (e.g. 4.0, 3.2, 2.1).  (Continuous)
• Number of pets owned (e.g. 1, 2, 4). (Discrete)
• Bank account balance (e.g. \$100, \$987, \$-42. (Continuous)
• Number of stars in a galaxy (e.g. 100, 2301, 1 trillion) . (Discrete)
• Number of lottery tickets sold (e.g. 25, 2,789, 2 million). (Discrete)
• How many cousins you have (e.g. 0, 12, 22). (Discrete)
• The amount in your paycheck (e.g. \$200, \$1,457, \$2,222). (Continuous)