Set 3: Linear Functions (Intermediate)

Explanation

Answer: A

Which correlation coefficient ( $r$ ) represents the strongest linear relationship?

$-0.9$

✓ Correct

$0.8$

$0.1$

$-0.5$

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Magnitude of $r$ . 1. Strength: Determined by absolute value $|r|$ . 2. Compare: $|-0.9| = 0.9$ , $|0.8| = 0.8$ , etc. 3. Result: 0.9 is closest to 1. Strategic Tip: The sign tells direction; the number tells strength. -0.9 is stronger than +0.8. Choice B is incorrect. Choice C is incorrect. Choice D is incorrect.

Key Steps:

•

The correct answer is $-0.9$

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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