Question 1
Paper 1Easy5 marksA fieldwork study records the daily hours of sunlight and the height of a plant in six plots.
| Plot | A | B | C | D | E | F |
|---|---|---|---|---|---|---|
| Daily sunlight (hours) | 2 | 4 | 6 | 8 | 10 | 12 |
| Plant height (cm) | 4 | 9 | 13 | 18 | 22 | 7 |
(a)[2]
Use a graphic display calculator to find Spearman’s rank correlation coefficient, for these data. Give your answer to three significant figures.
(b)[1]
State the direction of the association indicated by
(c)[1]
If the researchers want to assess a linear relationship, rather than a monotonic relationship in general, name the more appropriate coefficient: Pearson’s product-moment correlation coefficient or Spearman’s rank correlation coefficient.
(d)[1]
Plot F appears to be an outlier. State which of these two coefficients is generally less sensitive to an outlier.