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In this coursework I am going to investigate what influences the prices of a second hand car.

Extracts from this document...

Introduction

Introduction

In this coursework I am going to investigate what influences the prices of a second hand car. In order to be successful I will find out how the engine of a car, age of a car, price of a car and the colour of a hand car will affect the second hand price. There are 25 makes of cars, but I will only look 8 makes, that come up a lot, to give me an idea of what is influencing the second hand price of the cars. The makes of cars are as follows:

Ford

Vauxhall

Peugot

Volkswagen

Rover

Fiat

Nissan

Renault

Firstly I will start by looking at the ages of all the cars above and see how it affects the

...read more.

Middle

image11.png

This graph is a negative correlation and shows that as the age of the Peugot car increases the second hand price goes down

image12.png

This graph is positive correlation and shows that as the engine size increases, the second hand price goes up by a small amount.


Volkswagen

image13.png

This graph is a negative correlation and shows that as the age of the Volkswagen car increases the second hand price goes down

image14.png

This graph is positive correlation and shows that as the engine size increases, the second hand price goes up by a small fraction.


Rover

image15.png

This graph is a negative correlation and shows that as the age of the rover car increases the second hand price goes down

image16.png

This

...read more.

Conclusion


Standard deviation

I am going to use standard deviation because it measures the spread of the data about the mean valve. It is useful in comparing sets of data which may have the mean but a different range. For example, the mean of the following two is the same: 15, 15,15,14,16 and 2.7.14.22.30. However, the second is cleverly more spread out. If a set has a low standard deviation, the values are not spread out too much.

Standard deviation will give me me a more detailed picture of the way in which the data is dispersed about the mean as the centre of the distribution. Its main use is to compare two sets of data.

image08.png

...read more.

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