Stage 9 - Q10 - 6 marks
20186
The paired readings come from machine types A and B. Describe the association in each type and in the pooled data. Explain why the pooled trend should not be used alone to claim that increasing x raises y for either machine type.
Response y
0
1
2
3
4
5
6
7
8
0
10
20
30
40
50
Setting x
A
B
Hint
Follow the points within each labelled group before considering all six together.