# I will research the cars by putting the data I have been given into statistical charts, graphs and tables to analyse them. I will use a scatter graph to firstly look at how age affects all cars depreciation

Plan

This piece of coursework has asked me to look at the prices of used cars and what makes their prices decrease. I think that the most important thing to do is to work out the depreciation of all of the 100 cars. I will do this first because I think that this will make the cars more easily comparable and put them all into percentage form. I will work out depreciation by using this equation.

• D= C  x100

O

• D= Depreciation
• C= Change in price
• O= Original price

This is the equation to work out the depreciation of a car.

I will research the cars by putting the data I have been given into statistical charts, graphs and tables to analyse them.

I will use a scatter graph to firstly look at how age affects all cars depreciation. This will have either a line or curve of best fit. If it is a straight line I can work out the equation of the line. The equation for this is:

• Y=M><+C
• Y= Depreciation
• M= The gradient of the line
• ><= Age
• C= Where the line intercepts the y-axis

This means I can approximately calculate the age of any car from only the depreciation and vice-versa.

From the line I can also create a box plot and read the lower and upper quartiles, the inter quartile range, the median and the range. On this graph the lower quartile would show that a car loses a quarter of its value in however many years, the upper would show that the car depreciates three quarters in however many years and the median, half in however many years. The inter quartile range would show the distribution of the central fifty percent of the cars.

I will then investigate the depreciation of a specific age to test my results.

I will go on to investigate the depreciation for age brackets. This will be best shown with a histogram as this will allow me to split the cars into nearly new, middle aged and old cars.

I will use a pictogram next to illustrate how different makes depreciate faster than each other. This is useful because it allows you to use a scale and can be organised easily to show least to most depreciation in an easily readable chart.

Next I will compare how similar cars depreciate differently. This will show obviously the differences which effect their depreciation and will be in a table.

I will also look at older cars and how they may depreciate more because of their lack in technology. This will be simply portrayed in a table.

Then I will go on to investigate how mileage effects depreciation. I will do this to try and see if mileage has a larger bearing on depreciation than age does. I will do another line graph. If it is straight, I will repeat what I plan to do earlier about the equation of the straight line. I will also do an example to show my results.

I will then make a cumulative frequency table on depreciation per one thousand miles. With this I can work out the mean, median and mode.

I will also make a cumulative ...