I am going to calculate the number of each type of car according to its age and mileage. I would provide my entire hypothesis to get more accurate results and also to include my prediction. I would provide me working on computer to avoid biased results and also to get more accurate results. I think doing my investigation on computer would give a better pictorial view than by hand.
I predict that as the age of car increases the mileage would increase. I think that this is because an older car would have been driven more than a new car and therefore it would be a higher mileage. I would provide tally charts for the most popular cars.
This is for ford only
This shows that I was correct about the mileage in my hypothesis there are hardly any cars with a very high mileage and there are only a few with smaller mileages.
I would provide another tally chart but this time I would make it for a different model of car. I would investigate a different mileage of different cars to go into deeper investigation.
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 and the 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
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.
In the second scatter diagram, which shows the price and age of cars for Vauxhall only. As you could see again as the age increases the price decrease because the higher the age means it has been used a lot, so customers would give low prices.