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Statistics
Edexcel GCSE Statistics
Processing, representing and analysing data
Scatter diagrams and correlation
Lines of best fit
Edexcel GCSE Statistics · 1ST0
Lines of best fit
What you need to know
Determine an estimated line of best fit by eye across a bivariate scatter diagram.
Enhance the accuracy of a line of best fit by ensuring it is drawn precisely through the calculated double mean coordinate
(
x
ˉ
,
y
ˉ
)
(\bar{x}, \bar{y})
(
x
ˉ
,
.
Revision notes
1
Lines of best fit
7 key terms
Pro
Practise with past papers
Key terms & definitions
Previous subtopic
Correlation versus causation
Next subtopic
Spearman's rank correlation
y
ˉ
)
Construct an accurate line of best fit directly from the established linear regression equation taking the form:
y
=
a
+
b
x
y = a + bx
y
=
a
+
b
x
Evaluate the differing degrees of statistical reliability regarding estimations made via interpolation compared with extrapolation.
Interpret what the physical gradient and intercept values of the regression line functionally represent in the context of the problem.
2e.04 Lines of best fit — Edexcel Statistics 1ST0 | GradeGen
