What is the quadratic regression equation for the data set?
1 Answer
Explanation:
"substitute the given values for x into the equations and"
"check result against the corresponding value of y"
"the 'simplest ' value to start with is x = 10"
" starting with the first equation and working down"
"looking for an answer of "x=10toy=17.48
y=0.056x^2+1.278xto(color(red)(1))
color(white)(y)=(0.056xx100)+(1.278xx10)
color(white)(y)=5.6+12.78=18.38!=17.48
y=0.056x^2-1.278x-0.886to(color(red)(2))
color(white)(y)=(0.056xx100)-(1.278xx10)-0.886
color(white)(y)=5.6-12.78-0.886=-8.066!=17.48
y=0.056x^2+1.278to(color(red)(3))
color(white)(y)=(0.056xx100)+1.278
color(white)(y)=5.6+1.278=6.878!=17.48
y=0.056x^2+1.278x-0.886to(color(red)(4))
color(white)(y)=(0.056xx100)+(1.278xx10)-0.886
color(white)(y)=5.6+12.78-0.886=17.49~~17.48color(white)(x)✔︎
"this appears to be the correct equation"
"As a further test choose some other values of x "
