This work has been released into the public domain by its author, Qef. This applies worldwide. In some countries this may not be legally possible; if so: Qef grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Created with the following Gnuplot file:

set terminal svg font "Bitstream Vera Sans,24" set output "Linear-regression.svg"  set xrange [0:1] set yrange [2:6] set xzeroaxis linetype -1 set yzeroaxis linetype -1 set xtics border nomirror 0.5 set ytics border nomirror 2 set key off set border 15 set samples 2  # duh, straight line  plot '-' with points pointtype 6 pointsize 1.5 linecolor 6 0.84018771715471	5.0920721752254 0.78309922375861	5.4993770054934 0.91164735793678	5.0219594480046 0.33522275571489	3.663139781769 0.27777471080319	3.2292176040979 0.47739705186216	4.0677809238643 0.36478447279184	3.5137723092023 0.95222972517471	6.3816035819077 0.6357117279599	4.7956233221396 0.1416025553558	2.7597376235082 0.01630057162433	2.0398219692681 0.13723157678602	2.9002851883054 0.15667908925408	2.6485946288034 0.12979044678146	2.3215484331961 0.99892451800356	5.3518979261186 0.5129323944044	4.4596524827421 0.61263983259566	4.1465031113153 0.63755226770302	4.5417962600388 e plot 3.7*x+2.15 with lines linewidth 3 linecolor 1 

The actual data is just randomly choosen points along the line, randomly displaced from it, created with a small Lua program:

function f (x) return 3.7 * x + 2.15 end  for _ = 1, 18 do     local x = math.random()     print(x, f(x) * (0.85 + 0.3 * math.random())) end