Investigate what influences the price of a second hand car.

To represent my data I will use excel to make a scatter graph, line/bar graph or a pie chart but to compare data I will have to use a scatter graph. When I have drawn my scatter graph I will be able to see either a positive or negative correlation by this I will be able to prove my hypothesis.

Mean average: The mean of a set of data is the sum of values divided by the number of values;

Mean=Sum of values

Number of values

Scatter Diagrams: Scatter Diagrams can be used to show whether there is a relationship between the two sets of data.

Positive correlation: As one quantity increases the other one increases: as one quantity decreases the other one decreases.

Negative correlation: As one quantity increases the other quantity decreases.

Main Body/Findings:

Hypothesis 1: I think that the older the car the cheaper it will be.

Conclusion: My Hypothesis has been proven as you can see from the graph below as the age goes up the price of the car goes down.

In the graph below there is a negative correlation: As one quantity increases the other decreases.

Hypothesis 2: The higher the mileage the cheaper the car.

Conclusion: Due to missing values (in terms of mileage) I was unable to gain proper results and therefore was not able to prove my hypothesis.

Hypothesis 3: The smaller the engine the more cheaply it will be.

Conclusion: As you can see from my graph above my hypothesis has been proven, the smaller the engine the cheaper the car.

Hypothesis 4: The less owners the more expensive the car will be.

Conclusion: Due to missing data my graph is not accurate so I'm unable to prove my hypothesis.

Hypothesis 5. I think that the more doors the more expensive the car.

Conclusion: On my graph there seems to be no connection between the price of the car and the number of doors. It seems to me that some cars with 4 doors are more expensive than a car with 5 doors. Therefore my hypothesis was not proven as was incorrect.

Hypothesis 6: The less seats the cheaper the car.

Conclusion: My graph seems to show that there is no relationship between the number of seats and the price of a car.

On my graph it reads that a 4-seat car would be more expensive than a 7-seat car.

Consequently my hypothesis yet again has not been demonstrated

Evaluation:

Most of my graphs went well. Creating my graphs wasn't difficult, but the only thing that ruined them was the missing values. If there were a missing value the graphs were incorrect and I couldn't prove my hypothesis.