Definitions
A type of graph that uses rectangular bars
Bar Graph
What is Data?
A collection of numbers gathered to provide you with information about something.
When you gather information YOURSELF
Primary Data
A single set of data is collected from a subject (ex- a graph that compares the test scores of students in a math class)
One-Variable data
An ENTIRE group of people or items that is studied
Population
A type of graph that represents data using images or symbols.
Pictograph.
What is a Survey?
A way to collect data by gathering information about people by asking them a list of questions.
When you look at data that has already been gathered (research on the internet or use someone else's findings)
Secondary Data
2 sets of data collected from the same subjects- you might collect both height and arm span of a population to see if there is a relationship between those two variables.
Two-variable data
Is any part of the population
A sample
A diagram that uses circles to visually represent the differences and similarities between two things.
Venn Diagram
When that data is in WHOLE number form
Discrete Data
Data that is measured (time, weight, height, age, etc.)
Quantitative Data
When an ENTIRE population is being surveyed...
Census
What is an Attribute?
Characteristics, or that help group different persons or objects.
When data can have in-between answers (decimals) For example- Age- is always changing and can have in-between answers, Height- You can be a decimal number, You do not need to be a WHOLE number only)
Continuous Data
When you choose a random sampling strategy before beginning a survey- The sample could be chosen from an alphabetized list of names, using a starting name and then counting every fourth name to be randomly chosen
Systematic Random Sampling
When we select people randomly
Random Sampling
What does Analyse mean?
To look closely at data or information, think about what it shows and figure out what it means.
Categorical Data (favourite movie, colour, sport, etc.)
When we take a population and spit them into two groups and then random sample that groups separately
Stratified Sampling