Scatter Plots and Trends flashcards

Question 1

What is a scatter plot?

Accepted Answer

A graph that shows paired data as points $(x,y)$ to help reveal a relationship (trend) between two numerical variables.

Question 2

What is the difference between positive correlation and negative correlation?

Accepted Answer

Positive: $x \uparrow \Rightarrow y \uparrow$ (upward trend). Negative: $x \uparrow \Rightarrow y \downarrow$ (downward trend).

Question 3

What is the difference between interpolation and extrapolation on a scatter plot?

Accepted Answer

Interpolation predicts within the range of observed $x$-values; extrapolation predicts outside that range (usually less reliable).

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