Scatter Graphs

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Mathematics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

Plot one variable on each axis. Step back and read the overall shape, not single dots.

Strong means dots hug a line; weak means they spread out. Direction and strength are separate ideas.

It does not need to hit any dot or the origin, but it should pass through the mean point (mean x, mean y).

A hidden 'confounding' variable may drive both. Ice cream sales and drownings both rise - because of hot weather.

scatter graph	a graph that plots pairs of values to investigate a link between two variables
correlation	a statistical relationship shown by a pattern in a scatter graph
positive correlation	as one variable increases the other also increases; points slope up
negative correlation	as one variable increases the other decreases; points slope down
line of best fit	a straight line drawn to represent the overall trend of the data
mean point	the point (mean of x, mean of y); the line of best fit passes through it
interpolation	predicting a value inside the range of the collected data
extrapolation	predicting a value outside the range of the collected data
confounding variable	a hidden third variable that affects both measured variables

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