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Questions and Answers
What is the primary characteristic of a variable?
What is the primary characteristic of a variable?
What type of variable cannot be specified in numbers?
What type of variable cannot be specified in numbers?
What is an example of a random variable?
What is an example of a random variable?
What is a characteristic of quantitative variables?
What is a characteristic of quantitative variables?
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What is true about measurements made on quantitative variables?
What is true about measurements made on quantitative variables?
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What is the characteristic of discrete variable?
What is the characteristic of discrete variable?
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Which of the following is an example of continuous variable?
Which of the following is an example of continuous variable?
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What is the purpose of measurement?
What is the purpose of measurement?
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What is the characteristic of nominal scale?
What is the characteristic of nominal scale?
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Which measurement scale is used to classify objects or events into mutually exclusive and collectively exhaustive categories?
Which measurement scale is used to classify objects or events into mutually exclusive and collectively exhaustive categories?
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Study Notes
Variables
- A variable is a factor that can change in quality, quantity, or size, and its characteristics take different values in different persons, places, or things.
Types of Variables
- Categorical or Qualitative Variable: A variable that cannot be specified in numbers, and therefore, categories have to be made for it. Examples: title of a book, blood group of a student, gender, and grades of students in a course.
- Quantitative or Numerical Variable: A variable that can be specified in numbers, and can be measured in the usual sense. Examples: age, weight of pre-school children, number of pages in a book, and weight of a person.
Random Variable
- A random variable is a variable whose values obtained arise as a result of chance factors, and cannot be exactly predicted in advance. Example: adult height.
Discrete Variable
- A discrete variable is a characteristic that is countable and can take on discrete values. Examples: number of children in a family, birth year of a student, and number of missing teeth.
Continuous Variable
- A continuous variable is a characteristic that is measurable and can assume all possible values within a given range of values. Examples: weight, pressure, and skull circumference.
Measurement
- Measurement is the assignment of numbers to objects or events according to a set of rules.
- Nominal Scale: The lowest measurement scale, which involves "naming" observations or classifying them into various mutually exclusive and collectively exhaustive categories. Examples: medical diagnoses, classification of male-female, and well-sick.
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Description
Learn about the types of variables in statistics, including categorical and quantitative variables, and how they are used in data analysis.
