A group of scientists wants to investigate if they can predict the life expectancy of mammal species given its average heart rate. The table below shows the relationship between average heart rate (in beats per
minute) and life expectancy (in years) for a sample of mammals.
Whale
Horse
Lion
Sheep
Pig
Elephant
30
Average heart rate (BPM)
20
34
50
75
95
Life expectancy (years)
70
70
40
13
15
25
All of the scatter plots below display the dhta correctly, but which one of them displays the data best?
By convention, a good scatter plot uses a reasonable scale on both axes and puts the explanatory variable on the
X-axis.