1 no 2 yes 3 no 4 yes, yes, no, yes, no Exercise 4A 1 a positive correlation b no correlation 6 a b 2 a positive correlation b no correlation 3 a negative correlation b negative correlation 4 a 7 8 b negative correlation c Draw a line of best fit through the points on the graph and see what temperature corresponds to 22 gulls. 5 Investigation: Comparing marks own answers, for example: pupils’ Mathematics/Science positive correlation, Mathematics/Art positive correlation Exercise 4B 1 a 3 km b 30 minutes c This section of the graph is steeper. d He has missed the return journey, which is also 8 km. 2 a 6 b 12 c He could be correct, as the shortest throw is between 0 and 1 metre. d Yes, the total number of throws is 21. 3 a No, just under half of the pie chart represents daffodils. b You would need to measure the angles for crocuses and anemones. 4 a Andy b Duncan c We only know percentages, not the actual number of games. d David, as he has the lowest percentage of wins and the highest number of losses.
1 no 2 yes 3 no 4 yes, yes, no, yes, no Exercise 4A 1 a positive correlation b no correlation 2 a positive correlation b no correlation 3 a negative correlation b negative correlation 4 a b negative correlation c Draw a line of best fit through the points on the graph and see what temperature corresponds to 22 gulls. 5 6 a b 7 8 Investigation: Comparing marks pupils’ own answers, for example: Mathematics/Science positive correlation, Mathematics/Art positive correlation Exercise 4B 1 a 3 km b 30 minutes c This section of the graph is steeper. d He has missed the return journey, which is also 8 km. 2 a 6 b 12 c He could be correct, as the shortest throw is between 0 and 1 metre. d Yes, the total number of throws is 21. 3 a No, just under half of the pie chart represents daffodils. b You would need to measure the angles for crocuses and anemones. 4 a Andy b Duncan c We only know percentages, not the actual number of games. d David, as he has the lowest percentage of wins and the highest number of losses.