Scatter Plots (Leaving Cert Mathematics): Flashcards
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14 cards from this deck
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Practise the cards
14 cards from this deck
What is the purpose of scatter plots?
What is the purpose of scatter plots?
Determine if two variables are related and to what extent
What does each point on a scatter plot represent?
What does each point on a scatter plot represent?
A pair of values for the two variables
What is positive correlation?
What is positive correlation?
As one variable increases, the other also increases
What is negative correlation?
What is negative correlation?
As one variable increases, the other decreases
What does no correlation mean?
What does no correlation mean?
No clear relationship between the two variables
Scale requirements on scatter plot axes
Scale requirements on scatter plot axes
Increase in equal steps, evenly spaced
Purpose of line of best fit
Purpose of line of best fit
Shows the general trend in the data
How should points balance around line of best fit?
How should points balance around line of best fit?
Same number of points above and below the line
Two key factors determining correlation
Two key factors determining correlation
Direction and strength
Strong correlation characteristic
Strong correlation characteristic
Points closely clustered around line of best fit
Weak correlation characteristic
Weak correlation characteristic
Points more spread out from line of best fit
Which direction does positive correlation line slope?
Which direction does positive correlation line slope?
Slopes upwards
Which direction does negative correlation line slope?
Which direction does negative correlation line slope?
Slopes downwards
Use of line of best fit
Use of line of best fit
Predict values not in original data set