Question 352117
a) {{{drawing(300,300,-10,40,-50,300,grid(1),
circle(10    ,                                 93,0.8),
circle(15   ,                                  171,0.8),
circle(20  ,                                   204,0.8),
circle(20 ,                                    156,0.8),
circle(35,                                     261,0.8),
graph(300,300,-10,40,-50,300,0))}}}
.
.
.
b) From my EXCEL spreadsheet,
{{{xave=20}}}
{{{yave=177}}}
{{{SSXX=350}}}
{{{SSYY=15318}}}
{{{SSXY=2130}}}
{{{b1=SSXY/SSXX=6.036}}}
{{{b2=SSXY/SSYY=0.139}}}
{{{r^2=b1*b2=0.846}}}
{{{a=yave-b1*xave=55.286}}}
.
.
.
{{{highlight(y=6.036x+55.286)}}}
.
.
.
Regression line plotted with the data.
.
.
.
{{{drawing(300,300,-10,40,-50,300,grid(1),
circle(10    ,                                 93,0.8),
circle(15   ,                                  171,0.8),
circle(20  ,                                   204,0.8),
circle(20 ,                                    156,0.8),
circle(35,                                     261,0.8),
graph(300,300,-10,40,-50,300,6.036x+55.286))}}}