The scatterplot below displays the body length, in centimetres, of 17 crocodiles, plotted against their head length, in centimetres. A least squares line has been fitted to the scatterplot. The explanatory variable is head length.
Question 12
The equation of the least squares line is closest to
- head length = –40 + 7 × body length
- body length = –40 + 7 × head length
- head length = 168 + 7 × body length
- body length = 168 – 40 × head length
- body length = 7 + 168 × head length
Question 13
The median head length of the 17 crocodiles, in centimetres, is closest to
- 49
- 51
- 54
- 300
- 345
Question 14
The correlation coefficient \(r\) is equal to 0.963
The percentage of variation in body length that is not explained by the variation in head length is closest to
- 0.9%
- 3.7%
- 7.3%
- 92.7%
- 96.3%