SME
Grade 9 Math · Problem type
Positive, negative or none?
Use this for “Which scatter plot shows a negative correlation?” or “What does r = −0.78 say?”
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What kind of correlation is it?
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Assumptions
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The sign of r says which way the points go; how close r is to 1 or −1 says how tight they are.
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Positive: as one variable goes up, the other tends to go up.
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Negative: as one goes up, the other tends to go down. None: no trend either way.
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The least-squares line and r
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Systems by elimination, and systems of linear inequalities
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