• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15

Investigate what affects the used price of a car.

Extracts from this document...

Introduction

Zeta Blakeley Statistics Coursework I am going to investigate what affects the used price of a car. I have been given a spreadsheet by my teacher containing 204 cars of various different makes and models with information such as; mileage, age, new price, used price, engine size and colour. I am planning to investigate some factors like age, mileage, and make. To do this I am going to draw 2 comparative pie charts, tables and scatter diagrams. I will look for correlation, or anything that stands out. I am also going to use Spearman's Rank Correlation Coefficient to find the strength of the correlation. I will come to a conclusion and look to improve. Hypothesis 1 "The make/type of a car does affect the used price". To prove this hypothesis I have sampled a population of cars in the spreadsheet given to me by my teacher. I have chosen to take all of the fords and all of the Mercedes because these two groups have the most substantial amount of cars, using all of the cars under these groups for they are a reasonable amount to test yet I have excluded three cars; one Mercedes because it has no used price in the spreadsheet, and two Fords because one is missing the used price and the other is missing a new price. ...read more.

Middle

I'm going to investigate if the second hand price of a car is affected by its age. I am going to use 25 cars to produce a scatter diagram. My scatter diagram will have age on the x axis and the used price on the y axis because the price is being affected. I will use only fords so my data isn't bias against different makes of cars. When selecting my data I decided not to use all of the fords because I didn't want my scatter diagram to be to busy and hard to read, so I used random sampling so every car has an equal chance of being used. I did this by using the same method that I used in hypothesis 2. I predict that my scatter diagram will have a negative correlation because I think the younger the car the higher the cost. I drew my line of best fit by using (x, y). Where I worked out that the mean age was 7.92 and the mean price was �3479. So my line of best fit will go through the point (7.92, 3479). My Scatter diagram shows: * There is a negation correlation * It is a weak/moderate correlation * There are no obvious anomalous results I can use the line of best fit to make predictions. ...read more.

Conclusion

I took random samples and produced scatter diagrams and found that in the samples I took the scatter diagrams produced did not back up my hypothesis although could be improved by using more controlled variables such as the model. My second hypothesis was "The larger the mileage the cheaper the used price of a car". I again took a random sample and produced scatter diagrams, this time I found that my hypothesis was right. My final hypothesis was "The older the car is, the least expensive the used price". I took more random samples and produced scatter diagram, and I also use SRCC to find the strength of the correlation. I found that my hypothesis was right. If I was to re-do my coursework to make it better I would use primary data as the spreadsheet I was given could have gone out of date and isn't as reliable as primary. I would also use better sampling techniques such as quota because then it would have been a fairer test. As well to improve I could use larger samples, which will make my work more precise and reliable and will also help with investigate a larger population. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Miscellaneous section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Miscellaneous essays

  1. GCSE Maths Statistics Coursework

    1.80?x<1.85 1.825 0 0 3.330625 0 1.85?x<1.90 1.875 0 0 3.515625 0 1.90?x<1.95 1.925 0 0 3.705625 0 10 15.95 25.49625 Mean= ?fx/?f = 15.95 � 10 = 1.595 Variance = (?fx2/?f) - Mean2 = 25.496 � 10 - 2.544 = 0.006 Standard deviation = V Variance = 0.077 Yr11G x Frequency (f)

  2. French Speaking

    J'y vais a en autobus parce que c'est commode. Il y a de la pollution dans ton village/ ta ville? Pourquoi? Is there pollution in your town? Why? Oui au centre ville a cause de la circulation il y a beaucoup de bruit et de pollution?

  1. Should cannabis be used as a medical drug?

    Http://news.bbc.co.uk/1/hi/health/4438498.stm Evidence for beneficial effects There is some evidence to show the beneficial effects of cannabis: A recent study in New York (28/06/07) showed that cannabis significantly increased calorie intake and body weight in HIV patients. Http://norml.org/index.cfm?Group_ID=7289 A study in the US showed that cannabis reduces nausea and vomiting after cancer chemotherapy.

  2. Marketing courseowrk task 3 memo

    This would mean that it would increase the customer volume of the park and therefore it would bring more money to be spent on the theme park. Magazines and posters are something that people tend to buy on their daily bases therefore they may end up buying the paper or

  1. My Beautician hand book - Basic skincare. How make-up should be applied to different ...

    Apply green cover stick before your foundation if you have any pimples or red areas. 5. Take a brush and apply some cover stick onto your eyelids, around your nose and onto your mouth. This creates a base for your make-up and ensures that it stays on longer. 6.

  2. How does steven speilberg use filmic techniques to build tension and suspense in jaws

    Non-diegetic music is used throughout this scene and mysterious and disturbing sounds permeate the theatre, before abruptly disappearing. This can be compared to the behaviour of a shark, leisurely circling its prey, vanishing without warning and then ambushing the victim from an unknown quarter.

  1. Humanities Coursework Oldham

    I researched and found that the media often reinforces racial attitudes. Black people or ethnic minority groups are often presented in a negative way and often defined as a problem. A Scapegoat is when a society is faced with difficult problems; there is a tendency to blame powerless minorities who can easily be identified as outsiders.

  2. GCSE Astronomy controlled assessment - B4 Constellation Photography

    The problem of sky glow could have also been slightly reduced if I went out at a later time when most of my neighbours would have their lights turned off, but this is no guarantee. Sky glow is damaging to astrophotography as is creates a slight orange haze on photographs

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work