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Introduction In this assignment my aim is to investigate differences between height and weight in different year groups of boys and girls in Mayfield High School. However this is a very general aim therefore I will also try to find out whether it is true that girls in year 11 weigh less than girls in year 9, or when boys start growing faster than girls. This will also make my investigation a lot more interesting. In order to make it simpler for me I will use stratified random sampling of 10% of the total number of students in Mayfield High School. Stratified Sampling This is the method used to gather information randomly; this is also the method I will use in this assignment. I chose to use a sample of 10% if the students in Mayfield High School. The table below shows the total number of boys and girls in each year group. Year Group Pupils Boys Girls Year...

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