Investigation on the weights and heights of boys and girls at Mayfield High School.

Kelvin Stapleton 10G4

Wednesday, 02 May 2007, 2:13:06 AM

Investigation on the weights and heights

of boys and girls at Mayfield High School

In this investigation I am going to use the secondary information in the datafile to get my data from.

In my investigation I am going to use the height and weight columns to get my data from and look at them to see how they change over the 5 year groups in the school. I picked these groups of data because they are better to use to find out whether the boys are taller than the girls in the year groups and how their heights and weights are related to each other. I assume the data is reliable because it comes from data based on a real school, but if I find any anomalous data I will make a note of it and not use it in my sample. The sample size I am going to use is a stratified sample of 10% of each gender in each year group. It will be fair because I will make all the percentages equal.

I hypothesise that the girls will be taller than the boys in year 7 and will change to become about the same by year 9 and then in year 11 the boys will be taller than the girls.

I am going to round all of my data to the nearest integer as you can’t take the results of half a person.

See Graph 1

See Graph 2