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HiSET: Math : Identify lines of best fit

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Example Questions

Example Question #1 : Summarize And Interpret Data Presented Verbally, Tabularly, And Graphically

Determine the linear regression line for the following paired data:

$\begin{matrix} \underline{x }&\underline{y} \\ 1 & 3.5 \\ 2 & 4.7\\ 3 & 6.0\\ 4 & 7.8 \end{matrix}$

Possible Answers:

y = 0.6974x - 1.336

y = 0.7692x- 1.615

y = 1.433x + 2.067

y= 0.6977x - 1.442

y=1.42x+ 1.95

Correct answer:

y=1.42x+ 1.95

Explanation:

The formula for a regression line for a set of paired data is the line of the equation

$y =b_{1}x+ b_{0}$ ,

where

$b_{1} = \frac{n (\sum xy)-(\sum x)(\sum y)}{n(\sum x^{2})-(\sum x)^{2}}$

and

$b_{0} = \overline{y} - b_{1}\overline{x}$ .

n = 4 , the number of pairs.

$\sum x$ is the sum of the values:

$\sum x = 1 + 2 + 3 + 4 = 10$

$\sum y$ is the sum of the values:

$\sum y = 3.5 + 4.7 + 6.0 + 7.8 = 22.0$

$\sum x^{2}$ is the sum of the squares of the values:

$\sum x^{2} = 1^{2} + 2^{2} + 3 ^{2} + 4 ^{2} = 1 + 4 + 9 + 16 = 30$

$\sum xy$ is the sum of the products:

$\sum xy = 1(3.5 )+ 2(4.7)+ 3(6.0)+ 4 (7.8) = 3.5 + 9.4 + 18.0 + 31.2 = 62.1$

Substituting:

$b_{1} = \frac{4 (62.1)-(10)( 22.0)}{4(30)-(10)^{2}}$

$= \frac{248.4-220}{120-100}$

$= \frac{28.4}{20}$

=1.42

$\overline{x}$ and $\overline{y}$ are the arithmetic means of the and values, respectively - the sums divided by the number of values:

$\overline{x} = \frac{\sum x}{n} = \frac{10}{4} = 2.5$

$\overline{y} = \frac{\sum y}{n} = \frac{22}{4} = 5.5$

$b_{0} = \overline{y} - b_{1}\overline{x}$

$b_{0} =5.5 - 1.42 (2.5)$

=5.5 - 3.55

=1.95

The equation of the linear regression line is y=1.42x+ 1.95 .

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Example Question #1 : Identify Lines Of Best Fit

Determine the linear regression line for the following paired data:

$\begin{matrix} \underline{x }&\underline{y} \\ 1 &10.0 \\ 2 &8.7\\ 3 & 7.1 \\ 4 & 5.0 \end{matrix}$

Possible Answers:

y = -1.6x + 11.9

y = -0.625x + 7.438

y= -0.5954x + 7.085

y = -1.66 x + 11.85

y = -0.876x + 8.54

Correct answer:

y = -1.66 x + 11.85

Explanation:

The formula for a regression line for a set of paired data is the line of the equation

$y =b_{1}x+ b_{0}$ ,

where

$b_{1} = \frac{n (\sum xy)-(\sum x)(\sum y)}{n(\sum x^{2})-(\sum x)^{2}}$

and

$b_{0} = \overline{y} - b_{1}\overline{x}$ .

n = 4 , the number of pairs.

$\sum x$ is the sum of the values:

$\sum x = 1 + 2 + 3 + 4 = 10$

$\sum y$ is the sum of the values:

$\sum y= 10.0+8.7+ 7.1 +5.0 = 30.8$

$\sum x^{2}$ is the sum of the squares of the values:

$\sum x^{2} = 1^{2} + 2^{2} + 3 ^{2} + 4 ^{2} = 1 + 4 + 9 + 16 = 30$

$\sum xy$ is the sum of the products:

$\sum xy = 1(10.0 )+ 2(8.7)+ 3(7.1)+ 4 (5.0) = 10.0+ 17.4+21.3 + 20.0= 68.7$

Substituting:

$b_{1} = \frac{4 (68.7)-(10)( 30.8)}{4(30)-(10)^{2}}$

$= \frac{274.8 - 308}{120-100 }$

$= \frac{-33.2}{20 }$

= -1.66

$\overline{x}$ and $\overline{y}$ are the arithmetic means of the and values, respectively - the sums divided by the number of values:

$\overline{x} = \frac{\sum x}{n} = \frac{10}{4} = 2.5$

$\overline{y} = \frac{\sum y}{n} = \frac{30.8}{4} = 7.7$

$b_{0} = \overline{y} - b_{1}\overline{x}$

=7.7 - (-1.66) (2.5 )

=7.7 +4.15

= 11.85

The linear regression line is the line of the equation y = -1.66 x + 11.85 .

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HiSET: Math : Identify lines of best fit

Study concepts, example questions & explanations for HiSET: Math

All HiSET: Math Resources

Example Questions

Example Question #1 : Summarize And Interpret Data Presented Verbally, Tabularly, And Graphically

Example Question #1 : Identify Lines Of Best Fit

All HiSET: Math Resources

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