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# An investigation into the relationship between height and weight at Mayfield High school

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Introduction

2002-04-18 An investigation into the relationship between height and weight at Mayfield High school Objectives: a) To investigate the relationship between height and weight across the whole of Mayfield school. b) To investigate the relationship between height and weight for boys and girls across the whole of Mayfield school. c) To investigate the relationship between height and weight with age (each year group), for boys and girls. Expectations: For a) I expect that the investigation of height and weight across the whole of Mayfield School will show a general pattern, this pattern being that as a child's height increases so does their weight. However, I also expect that for any given height that I will find a wide variation in weight. For b) I expect that an investigation into the height and weight of boys and girls will be as follows. ...read more.

Middle

I know this data (height and weights of the school children) is reliable because I have checked it, but there was missing data and faulty data and to get rid of it would simply replace it. For the sampling size I have chosen 120 boys from the whole school and 120 girls from the whole school. It will be a fair test because once stratified I will select randomly from each category. The reason I have stratified is so each year group is represented in proportion to their numbers .Also I will use the data to compare pupils from different age groups and to compare pupils in both genders (boys and girls). How will I collect the information? Firstly for the whole school I will choose two hundred and forty pieces of information (120 boys and 120 girls). ...read more.

Conclusion

How I will use the data I will use the data to create scatter graphs (because they show the relationship between the two quantities) for the boys and girls heights and weights, these graphs will include the line of best fit if appropriate. Also I will put together the boys and girl's data to create one scatter graph, doing this will enable me to observe if the correlation was better when the genders were separated. Also I will be plotting cumulative frequency curves (because thy enable me to get the median, upper quartile, lower quartile and inter-quartile range, this helps me to understand the spread of data about the median) for the height and the weight, for boys and girls. Another way we could display this information so that you could easily examine any differences is in the form of a box plot (using box plots helps me to compare the data of cumulative frequency graphs). ?? ?? ?? ?? Jonathan de Wind ...read more.

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