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draw a line of fit using 20, 25 and 25,30

Draw A Line Of Fit Using 20 25 And 2530 class=

Sagot :

The equation is

[tex]y=1.08989x+3.3427[/tex]

To find this equation we need to find the sum of all the values of x and y:

[tex]\begin{gathered} S_x=240 \\ S_y=295 \end{gathered}[/tex]

the mean for each variable is:

[tex]\begin{gathered} M_x=24 \\ M_y=29.5 \end{gathered}[/tex]

The sum of squares for each variable is:

[tex]\begin{gathered} SS_x=890 \\ SS_y=970 \end{gathered}[/tex]

now the regression equation is given as:

[tex]y=mx+b[/tex]

where m is:

[tex]m=\frac{SS_x}{SS_y}[/tex]

and

[tex]b=M_y-mM_x[/tex]

then:

[tex]\begin{gathered} m=\frac{970}{890}=1.08989 \\ b=29.5-1.08989\cdot24=3.3427 \end{gathered}[/tex]