Charles wants to measure the strength of the relationship between the price of a house and its distance from the city centre where he lives. He chooses houses of a similar size and plots a graph of price, P (in thousands of dollars) against distance from the city centre, d (in kilometers). Explain why it is not appropriate to use Pearson’s product moment correlation coefficient to measure the strength of the relationship between P and d. [1] Explain why it is appropriate to use Spearman’s rank correlation coefficient to measure the strength of the relationship between P and d. [1] The data from the graph is shown in the table below. Calculate Spearman’s rank correlation coefficient for this data. [6] State what conclusion Charles can make from the answer in part c). [1]