Andy was given data to draw 3 scatter diagrams. He also decided to draw a line of best fit on each one.
50
100
50
90
*
X
40 5
80
40
EX
X
70
X
F
X
30
60
30
50
X
IX
20
40
X
20
TX
30
*
X
10
20
10
0 0
10
30
40
50
10
0
0 10 20 30 40 50 60 70 80 90 100
Diagram B
00
2
8
10
Diagram C
20
Diagram A
a) What type of correlation is shown in diagram A?
b) Which diagram shows the strongest correlation?
c) Which line of best fit should not have been drawn?
Give a reason for your answer.