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Algebra 1 · S-ID
Scatter Plots — Correlation and Line of Best Fit
A scatter plot shows the association between two variables. A line of best fit models the linear trend; its slope and intercept carry real-world meaning.
A scatter plot of 36 students shows hours of study (x-axis) versus test score (y-axis). The points cluster tightly around a line going from lower-left to upper-right. (a) Describe the direction and strength of the association. (b) Is this correlation positive, negative, or no correlation? Explain. (c) Would you expect the line of best fit to have a positive or negative slope? Justify your answer.
Answer:
A scatter plot of 38 students shows hours of study (x-axis) versus test score (y-axis). The points cluster tightly around a line going from lower-left to upper-right. (a) Describe the direction and strength of the association. (b) Is this correlation positive, negative, or no correlation? Explain. (c) Would you expect the line of best fit to have a positive or negative slope? Justify your answer.
Answer:
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