The Relationship between Height and Weight in Mayfield High School

The Relationship between Height and Weight in Mayfield High School

The hypotheses that I have made are effective but simple. I expect to

find that:

1) Boys weigh more than girls

2) Girls are taller than boys in KS3

3) When I investigate the relationship between height and weight, I

expect to find that

the taller you are, the heavier you weigh.

4) Gender may affect the results that I will have attained by the end

of my investigation.

I possess a secondary source of data that I had obtained on a website

www.edexcel.com which had been posted by the examination board. I have

chosen to use a secondary source of data, as this data is easier to

obtain than raw (primary) data. I am taking in to account that this is

a secondary source of information; it could contain faults or could be

in some sort of way corrupt. To acquire such raw data, I would have to

perform a data research which could take a long period of time

depending on the investigation, population size and many other

factors.

The information that will be essential to collect for my investigation

is height, weight, gender and year group. I will use a sample size of

7% of the population size, 1183 students, which calculates to be 83,

rounded up to the nearest whole number. I had the option of selecting

any sample size between 5% and 10%. Furthermore, I know that the

bigger the sample the more useful the data will be, but I chose a

small sample size because I believe that it will be easier to manage

and to analyse.

I will make sure that my sample is fair by reducing all the odds of it

being biased by using this method which is called ‘stratified

sampling’. This is because data may be inequitable, for example, there

may be more pupils given in one year group than the other. The sample

should be kept proportional all throughout my investigation, so that