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A line of best fit predicts $y = 50$ at a given $x$, and the actual data point at that $x$ is 47. What is the residual?
A$50$
B$-3$
C$3$
D$47$
Answer & Solution
Correct answer: B. $-3$
Residual = observed $-$ predicted $= 47 - 50 = -3$. A negative residual means the actual value is below the predicted line.
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