Turn over 25 6 (a) Study Figure 6a below. A group of students used data about sediment size, from samples taken from four sites along the south coast of England, as part of an investigation about spit formation. Beach site Site 1 Site 2 Site 3 Site 4 Number of pebbles > 5mm 27 20 12 5 Figure 6a (i) State one reason for studying sediment size. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 26 Study Figure 6b below. The students carried out a Chi2 test to determine if there was any pattern in the distribution of pebble sizes > 5mm. The formula for Chi2 (X 2) is: Beach site Site 1 Site 2 Site 3 Site 4 Observed (O) 28 20 11 5 Expected (E) 16 16 16 16 (O − E)2 144 16 121 (O − E)²/E 9 1 1.6 7.6 Figure 6b (ii) Complete the table above by calculating the missing number in the Site 3 column. (1) (iii) Calculate the value of Chi2 (X 2) for the data given. (1) Chi2 (X 2) = ............................... Turn over 27 (iv) Suggest one reason for carrying out a Chi2 (X 2) test on this data set. 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(v) Explain two primary fieldwork methods that might have been used to extend this investigation on spit formation. (4) 1 ................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2 ................................................................................................................................................................................................................................................................................ .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 28 (b) You have carried out primary fieldwork to investigate coastal landscapes and change. Assess how the sampling procedures and sample size affected your results. (9) Geographical enquiry question: .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 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Turn over 29 .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 6 = 18 marks)