7. Suppose the regression line for a set of data, ? = 3x + b, passes through the point (2, 5). If x? and ? are the sample means of the x- and y-values, respectively, then ? = A. x?. B. x? - 2. C. x? + 5. D. 3x?. E. 3x? - 1.
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\[5 = 3(2) + b\] \[5 = 6 + b\] \[b = -1\] ** Show more…
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Rochan B.
Suppose the regression line for a set of data, $\hat{y}=3 x+b$, passes through the point (2,5) . If $\bar{x}$ and $\bar{y}$ are the sample means of the $x$ - and $y$ -values, respectively, then $\bar{y}=$ (A) $\bar{x}$. (B) $\bar{x}-2 .$ (C) $\bar{x}+5$. (D) $\mu_{\bar{x}}$. (E) $3 \bar{x}-1$
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