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Along 14 separate sections of highway measurements of trac volume (x) and rate of

accidents (y) were taken.

x; 303, 294, 242, 236 ,267, 213, 233, 292 ,287 ,215 ,231 ,195 ,255 ,298

y; 30, 27, 23, 20, 26, 20, 22, 29, 27, 20, 23, 20, 26 ,27

(a)Calculate the coefficient of correlation between trac volume and acci-

dent rate.

Sxy=1566.57

Sxx=16759.214

Syy=164.857

well i used the formula: r=Sxy/sqrt(Sxx*Syy)=0.94247

(b)Obtain residuals and sketch a residual plot (residuals against trac

volume). Explain what the plot tells us about the t of the regression

i know the general formula f(x)=a+bx, where i found a=0.509 and b=0.0934

but how do i obtain individual residuals

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# Calculating residuals help

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