Scatter Graphs (Leaving Cert Mathematics): Flashcards
📚Flashcards
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12 cards from this deck
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Practise the cards
12 cards from this deck
What is a scatter graph?
What is a scatter graph?
Visual tool to investigate relationships between two data sets
Bivariate data
Bivariate data
Data in pairs: two variables measured for same subject/time
Should you join points in scatter graphs?
Should you join points in scatter graphs?
Never join - shows individual data points, not continuous line
What is correlation?
What is correlation?
Strength and direction of relationship between two data sets
Positive correlation
Positive correlation
As one variable increases, the other also increases
Negative correlation
Negative correlation
As one variable increases, the other decreases
No correlation
No correlation
No clear relationship; points randomly scattered
Strong correlation
Strong correlation
Points lie close to an imaginary straight line
Weak correlation
Weak correlation
Points more spread out but still show a general trend
Linear relationship
Linear relationship
Points lie approximately on a straight line
How to describe correlation (2 parts)
How to describe correlation (2 parts)
Strength (strong/weak) & direction (positive/negative/none)
Correlation and causation
Correlation and causation
Correlation doesn't prove causation