Scatterplots and Association

Learn and apply scatterplots and association using equations, examples, and interpretation.

Lesson 1 of 53 parts Practice Flashcards

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Direction and Form

Objective: Explain and use direction and form in an Algebra 1 problem.

A scatterplot shows pairs of quantitative variables; an upward trend suggests positive association, downward suggests negative, and shape matters. No, other explanations may exist.

Worked examples

Try itExample 1.1: A fitted line is y=4x+14. Predict y when x=5.Show answer

34. Substitute the stated input into the fitted rule. The answer is 34.

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Direction and Form

Objective: Explain and use direction and form in an Algebra 1 problem.

A scatterplot shows pairs of quantitative variables; an upward trend suggests positive association, downward suggests negative, and shape matters. No, other explanations may exist.

Worked examples

Try itExample 1.1: A fitted line is y=4x+14. Predict y when x=5.Show answer

34. Substitute the stated input into the fitted rule. The answer is 34.

Outliers and Clusters

Objective: Explain and use outliers and clusters in an Algebra 1 problem.

A point far from the pattern is a possible outlier; investigate measurement, context, and influence before removing it. No, it may be real and informative.

Worked examples

Try itExample 2.1: Find the mean of 6, 8, and 10.Show answer

8. Add all three values and divide by three. The answer is 8.

Correlation Versus Causation

Objective: Explain and use correlation versus causation in an Algebra 1 problem.

A statistical relationship does not prove one variable causes another; confounding, selection, or coincidence may explain it. Influence both observed variables.

Worked examples

Try itExample 3.1: A fitted line is y=3x+34. Predict y when x=11.Show answer

67. Substitute the stated input into the fitted rule. The answer is 67.

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