For my third hypothesis I am doing the older you get the more weight you will put on this is because this database is all students who are teenagers- these are all growing so logically the more they grow the heavier they will be.

Here is my data

 

I will now use this data to produce a scatter diagram.

So is my hypothesis correct?

• There was a positive correlation in my scatter diagram, which would indicate this is the case because the line of best fit is slanted slightly lower and across which means the year seven spread is generally a lower amount.
• I will now plot a cumulative frequency diagram for each year.  

Year 11

Year 7

Now I have done my Cumulative frequency diagrams it has become obvious that the year 7 median of 43 kg is much lower than the year 11 one of 53 kg which proves that on average the older you get the heavier you get too. This is backed up by the year 11 upper quartile of 59 being higher than the year 7 one of 47. Also the lower quartile of 46, being higher than that of 40. Because of these results I can now conclude that my hypothesis is correct.