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## This is for fiat only

I have shown the above data on the graph above. This shows that my prediction was correct and as there are hardly any cars with a very high mileage and there are only a few smaller mileages.

For Vauxhall cars only

As you can see I have provided another data for a different model of cars which shows my prediction is true. The reason why I am providing diagrams for different makes of cars is because to get more accurate results.

## Conclusion for tally charts

After my tally chart investigation I have provided mileage, frequency and cumulative frequency for different makes of cars to go into deeper investigation. I am aiming to go slowly my making different diagrams at different times so there would be no confusion, so therefore I would be going on to pie charts.

In my opinion I think that the cars with the most mileage would obviously belong to someone that drives very often or long distances. This could be sales man, who drives from one state to another. Therefore Fiat and Ford would belong to someone that drives their cars for long distances. Whereas the Vauxhall would belong to someone that does not drive long distances. This may belong to a person who does not like driving a lot.

The cars with the most mileage would also bring the second hand price down and will be decreased. Whereas the Vauxhalls that will have a lower mileage will have a higher second hand price rate than the Fiats and the fords.

Overall I cannot make a statement that which would tell me which car is suitable to buy. I shall now investigate further into different variables that affect the cars.

## Pie chart and bar chart

Degrees to be plotted on the pie chart = (360 / total number of cars) times frequency.

I intend to show the number of cars upon a pie chart, this would show how much of the total amount of cars are divided

By looking at the graphs above it can be noticed that there are more fords than any other cars. As you can see that there are very less Peugeots. The reason why I have provided the two charts is because I think it would provide a pictorial view about what is happening. It is easy t gather information about what car is the most and less. The reason why I have provided my graphs on computer is because I think it would look more reliable and more accurate.

## Doughnut chart

I would now provide the mean, median and mode for the cars. First I will start with the make for Ford and the other makes to get more information.

## Scatter diagrams for some types of cars

By looking at the first scatter diagram, which is price and age of cars for ford, shows that as the age of car increases the age decreases. As you could you see the line of best fit, which shows us that what happens to the cars. I have added an equation for the scatter diagram.

As you can see I have made another scatter diagram for Vauxhall cars only. The reason why I have done this investigation is because to get information on each type of car which can lead to more information. As you can see I have done a scatter diagram for Vauxhall cars, which shows the price and age for each car. On the graph it shows that when the age increases the price decreases. As you can see I have done a line of best fit because when you look at the scatter diagram it shows what is happening to the cars as the price and age increase. I have added an equation for the scatter diagram.

As you can see I have provided another scatter diagram for Fiat cars only which I have done to get more information and also to prove my hypothesis are right. As you can see that the scatter diagram shows that the age increases and the price decreases. For the scatter diagram you can gather information about what is happening to the cars according to the age and price of cars. I have also provided the line of best fit, which easily shows how the changes happen. I have added an equation for the scatter diagram.

As you can see I have provided another scatter diagram for the type of cars Peugeot that I have also provided a line of best fit to gather information quick about what is happening. I have provided this scatter diagram to back up my hypothesis also to get more information about what is happening when the age increases and the price decreases, which therefore is what the scatter diagram shows that as the age increases the price decreases. I have added the equation as well to the scatter diagram.

As you can see I have done another scatter diagram for the type of car Rover. As you can see that as the age increases the price decreases. I have done this scatter diagram for Rover and different make of car because I think that each type of car would give me more information. I would say that the graph is accurate because it similar to the other graphs. As you can see I have put the graphs equation on as well.

### Conclusion for scatters diagrams

I have done scatter diagrams for each most common car because I think that looking at the all the cars gives me confusion so therefore I have done scatter diagrams for each type of car because I think it gives a more pictorial view about what is happening and also I would get more accurate results. As you cam see I have done the line of best fit because when you look at the scatter diagram it shows what is happing easily. I think what I have done has given more information and more accurate results. I have provided the equation for all the scatter diagrams to make sure I get more accurate results. The scatter diagrams were there to back up my hypothesis, which shows that ford has smaller engine size that, the other cars. I would now provide scatter diagrams for all the cars.

### Scatter diagram for all cars

As you can see I have done a scatter diagram for all the cars that is above. The scatter diagram shows price and age of cars. From the scatter diagram we learn that price does not increase a lot by the age and also the scatter diagram shows that my hypothesis were correct because when the age of a car increases the price decrease which shows on the scatter diagram.

As you can see I have provided a scatter diagram, which shows age and mileage of cars. From the scatter diagram you can learn that as the mileage of the car increases the age increases as well which is including my in my hypothesis.

The scatter diagram above shows the prices and engine sizes of cars. The reason why I have provided this is because it shows that as the price increases the engine size stays the same. I have done this because my hypothesis was like this as well so therefore I would now backup my hypothesis by doing this scatter diagram.

### Analysis of scatters diagrams

Overall with me providing scatter diagrams for all cars was because to prove my hypothesis was right and also to get into more investigation that includes doing more scatter diagrams. I found that providing scatter diagrams was very useful because it gives a clear idea on what happens. I think that my scatter diagrams was successful because as you can see I have done the equation for the diagrams and also I have done the line of best fit which is very important to me because it shows you what is happening to the scatter diagram as things change. I would no be moving on the more investigation to get more results. My opinion about the scatter diagrams is that it was easy to create but the reason why I had done it by computer is because it is very likely for me to do a mistake rather than computer which is very accurate.

### Analysis of Standard Deviation for all cars

### As you can see I have done standard deviation which has all the prices of cars and on X squared the price is times by itself to get that number. I would now describe a bit of how I done my standard deviation which is by first knowing about deviation from the mean, which is the difference between a particular value and the mean, is the deviation from the mean for that value. If you use x for the value and x for the mean then the deviation from the mean is x – x.

###
The mean for the above standard deviation is:

### 1493274 divide by 100 = 14,932.74

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The standard deviation would be:

300036289522 divide by 100 = 300,362,895.5

As you see I have worked out the mean deviation and also standard deviation. The way that I have worked this out was that I applied to the formula that I have used above. In my opinion I found the standard deviation easy to work out but it took me very long to calculate the totals. I think this is very useful to me because it shows I have gone in to more investigation.

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