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Used Car Sales Plan.

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Sean Willis 10E – Maths – Used car sales                                                       05/06/03

Used Car Sales Plan

The aim of this coursework is to investigate and find out data about a particular subject and then show that the data collected can be presented and compared in many ways using different types of tables, charts and graphs.

I am going to be looking at used car sales for my coursework. I will specifically be looking at the mileage and age of used as I think that these are the most relevant variables that will affect the value of used cars, other variables that could be used are;

  • New price
  • Engine size
  • Colour
  • Age
  • Make
  • Model
  • Fuel (diesel/unleaded)

To find out how the mileage and age affects the price, I will need to find a wide range of cars that have a wide range of mileages; this information is already available to me from the master spreadsheet provided by the school.


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Using lines of best fit should prove my theory, but I have come across problems with this as it shows negative values, like negative mileage, age and price. There may be some problems as some cars may increase in value as they age and gain higher mileages, these will show up as anomalies on my scatter graph and I will be able to discard this data. I will also use pie charts to show the different proportions of age, mileage and prices of used cars.

Problems that may occur;

  • Master spreadsheet may not have the needed information for my investigation.
  • The decrease in price may be affected by other variables; this could affect my results and cause them to be inaccurate.
  • I may not have enough time to use computers.

Collection of data

I have selected the data that I need

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I made a line graph to show the difference in price of all of the cars when new and when used, it shows that they all decreased in value.

The pie chart that I created shows the proportions of the different ages of the used cars, I used a pie chart because it shows the different proportions most clearly.

I made cumulative frequency graphs for the cars and there mileages, I used inter quartile ranges so that I could develop box plots and to eliminate anomalies. I also used cumulative frequency graphs to find trends in the ages of the cars; I then used this data to create box plots.

I used lots of different types of graphs and charts to show the different techniques of displaying data.

...read more.

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