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Presentation transcript:

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Types of Data

Definitions Data: A collection of information in context. Population: A set of individuals that we wish to describe and/or make predictions about. Sample: A subset of the population that data is collected from. Individual: Member of a population. Variable: Characteristic recorded about each individual in a data set.

Population Sample Individual

Types of Variables Categorical Variable: A variable that records qualities or characteristics of an individual, such as gender or eye color. Ex: gender Ex: eye color Ex: zip code Quantitative Variable: A variable that measures a characteristic of an individual Ex: height Ex: weight Ex: age numerical values Think of “how many” For the most part, we will focus on quantitative data. When describing categorical vs. quantitative, explain that sometimes numerical data is categorical. Think of quantitative data as “How many?” For example, when classifying a zip code as categorical or quantitative, you would ask, “What is your zip code?” not, “How many….zip code?”

What type is it? Categorical Quantitative Go over the Collect student data worksheet and discuss which type of variable each one is.

Categorical or Quantitative Data? Birth month Number of siblings Height in inches Average amount of time (in minutes) of your ride to school. Number of pets Year & model a car Age of your youngest parent Predicted letter grade of your first Math 1 test. Categorical Quantitative Quantitative Quantitative Quantitative Categorical Quantitative Categorical

Categorical or Quantitative? 1. Brand of vehicle purchased by a customer 2. Price of a CD 3. Number of students in a class of 30 who prefer peanut M&Ms over plain M&Ms 4. Phone number of all the students enrolled in school. 5. The height of a 1 year old child. Categorical Quantitative WORKSHEET!!! Quantitative Categorical Quantitative

Categorical or Quantitative? 6. Number of students in a class of 35 who turn in a term paper before the due date. 7. Gender of the next baby born at a particular hospital. 8. Amount of fluid (oz) dispensed by a machine used to fill bottles with soda. 9. Thickness of the gelatin coating of a Vitamin C capsule 10. Brand of computer purchased by a customer 11. State of birth for someone born in the United States. 12. Price of a textbook 13. The phone numbers of everyone in this class. 14. Actual weight of coffee in a one pound can. 15. The length of a rattlesnake. CW #1 parts a-j They do these!!! 6. Quantitative 7. Categorical 8. Quantitative 9. Quantitative 10. Categorical 11. Categorical 12. Quantitative 13. Categorical 14. Quantitative 15. Quantitative