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## Let’s ask this in a nicer way:

Does foot size increase with height and do boys have bigger feet than girls?

Let’s use some data from Census at School to find out.

On page 2, there is a table using data on height, foot size and gender. These data were taken from 60 randomly selected student records in the UK database.

- Draw a scatter graph with the X axis representing foot length and the Y axis showing height. (X scale from 14 to 30 , Y scale from 110 to 190)
- Mark boys and girls with different symbols or in different colours on your graph.
- Don’t forget to give a title to the graph and label the axes and add a key.

After admiring your handiwork try looking carefully at your graph and write a few conclusions.

- Can you identify any students who have particularly big or small feet for their height?
- Are there differences between boys and girls? What are they?
- Do the taller students have bigger feet?
- Is there positive, negative or no correlation?
- Can you draw in a line of best fit?

Think of some questions of your own to ask as well.

Pupil no. | Gender | Height | Foot |
---|---|---|---|

cm | |||

1 | F | 160 | 25 |

2 | M | 111 | 15 |

3 | F | 160 | 23 |

4 | F | 152 | 23.5 |

5 | F | 146 | 24 |

6 | F | 157 | 24 |

7 | M | 136 | 21 |

8 | F | 143 | 23 |

9 | M | 147 | 20 |

10 | M | 133 | 20 |

11 | F | 153 | 25 |

12 | M | 148 | 23 |

13 | M | 125 | 20 |

14 | F | 150 | 20 |

15 | M | 183 | 28 |

16 | M | 184 | 25 |

17 | M | 125 | 18 |

18 | F | 140 | 20 |

19 | M | 170 | 27.5 |

20 | F | 168 | 25.5 |

21 | M | 131 | 23 |

22 | M | 149 | 23 |

23 | F | 156 | 21 |

24 | F | 130 | 19.5 |

25 | F | 142 | 22 |

26 | F | 159 | 24 |

27 | F | 145 | 21.5 |

28 | F | 162 | 25 |

29 | M | 149 | 22 |

30 | F | 169 | 24.5 |

31 | M | 126 | 20 |

32 | M | 150 | 24 |

33 | M | 170 | 26 |

34 | F | 141 | 21 |

35 | F | 123 | 20 |

36 | F | 122 | 19 |

37 | M | 125 | 20 |

38 | F | 133 | 20 |

39 | M | 165 | 25 |

40 | F | 131 | 20 |

41 | F | 134 | 17 |

42 | M | 158 | 25 |

43 | F | 170 | 25 |

44 | F | 125 | 15 |

45 | F | 135 | 21 |

46 | F | 138 | 19 |

47 | M | 134 | 20.5 |

48 | M | 145 | 22 |

49 | F | 171 | 25 |

50 | F | 181 | 24 |

51 | F | 139 | 19.5 |

52 | M | 147 | 25 |

53 | M | 134 | 19 |

54 | F | 164 | 24 |

55 | M | 127 | 19.5 |

56 | F | 138 | 23 |

57 | M | 180 | 24 |

58 | M | 159 | 26 |

59 | F | 151 | 23.5 |

60 | M | 165 | 29 |

### How does this data compare with your own class data?

*Reproduced with permission from CensusAtSchool – U.K.*