6   Question 2 continued 35 30 25 20 15 10 5 0 Minimum desired female heights Minimum desired male height vs female height for various dog breeds Minimum desired male heights 0 5 10 15 20 25 30 35 Figure 4 (a) Explain why Alana might have chosen to plot her data before calculating a correlation coefficient. (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Turn over 7   Question 2 continued After examining Figure 4 Alana realises that one of the dog breeds has had the male and female columns recorded the wrong way round. (b) State, with a reason, which breed you believe has been recorded incorrectly. (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ The PMCC between the minimum desired height for males and females was calculated as r = 0.988 Alana says that the PMCC will be higher if the heights were measured in centimetres. (c) Explain why Alana is incorrect. (1) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Alana edits the data, swapping the values she realised had been recorded incorrectly. (d) How would you expect the PMCC of her corrected data to compare to the PMCC of the original data, r = 0.988? (1) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________