Hi all,we've started our plans for the coursework but unfourtanetly here in london we are on holidays.due to this my teacher has asked our class to do research for our hypothesis and data collection and work out the basics e.g. My two hypothesises are: age affects the price of asecond hand car.i think that has a 2nd hand car gets older the price of the car will be cheaper. The make of a second hand car affects the price.i think a bmw will cost less than a mercedes benz.

We ate told to use the webiste w.autotrader.co.uk extracts from this document. Introduction statistics coursework introduction during this investigation i will be analysing data taken from mayfield high school database, where by this data is stored electronically and is secondary data. I anticipate that year sevens will be smaller and weight less than year nine and eights. To prove or disprove this theory i will carry out some statistical analysis as described bellow.

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I will use body mass index bmi to create different diagrams such as box and whisker diagram. Fx v 7440/292 20.86 2.14 year seven girls bmi midpoint x frequency f fx fx2 12?x lt 14 13 1 13 169 14?x lt 16 15 3 45 675 16?x lt 18 17 4 68 1156 18?x lt 20 19 2 38 722 20?x lt 22 21 2 42 882 22?x lt 24 23 3 69 1587 24?x lt 26 25 1 25 625 26?x lt 28 27 0 0 0 28?x lt 30 29 0 0 0 30?x lt 32 31 0 0 0 total 16 300 5816 table 19 fx frequency x midpoint fx2 frequency x midpoint2 mean . Fx v 5826/300 18.75 0.82 year eight girls bmi midpoint x frequency f fx fx2 12?x lt 14 13 0 0 0 14?x lt 16 15 0 0 0 16?x lt 18 17 6 102 1734 18?x lt 20 19 5 95 1805 20?x lt 22 21 1 21 441 22?x lt 24 23 1 23 529 24?x lt 26 25 2 50 1250 26?x lt 28 27 1 27 729 28?x lt 30 29 0 0 0 30?x lt 32 31 0 0 0 total 16 318 6488 table 20 fx frequency x midpoint fx2 frequency x midpoint2 mean . Errm.last time i checkedi didnt look like this and i apologise for my high level of intelligence im drawing a scatter diagram and if you have worked out a mean do you plot this on the scatter diagram aswell and put the line of best fit through it. Is this still ok?? standard deviation tells you how spread out your data is around the mean. The class with the lower standard deviation are more consistent, as their scores are all bunched around the mean more. And dont worry about doing too many comparative box plots you got comparative cumulative freq.

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Too? ive done a scatter diagram and also and composite bar chartand thought that was enough for the diagrams section. I said that some of the calculations that were generated for my box plots were the calcs for that hypothesis, is that ok. Tiksha asks: could you please get back to me asap because i have an interim deadline for next week monday 3rd to get my plan done favourite type of music height m weight kg i was wondering if you could tell me which line of investigation would be the best in terms of allowing me to show the most skills. How would i go about writing an 'integrated' detailed hypothesis and what would i need to include in my plan and the project especially in terms of statistical skills i.e. Histograms etc to score highly? what is meant by the term 'regression analysis' and what is the formula i need to carry it out? finally, are there any resources/sites which could help me with this coursework? thank you so much for your help. Etutor answers: you need to start with a plan of what you think will be useful how you will collect your sample, what calculations and diagrams are going to help you prove your hypothesis.

It is not good enough to say what you are going to do you must say why in your plan if you are to get above a c. You will need to use b/c grade diagrams scatter diagrams, cumulative frequency, stem and leaf diagrams, box plots or calculations grouped mean etc. You must justify why you will use these diagrams to help you investigate further if you are going to add them to your coursework. There is no point just doing all the diagrams you know if you don't know what they show at the end.

Height and weight is a good choice but you need to be able to compare either boys against girls or different year groups to get above a d grade. To get the top grades you will need to use a systematic method to choose the sample for these comparisons. You mention regression analysis but i would be very wary of advising you about this until you have been able to do the diagrams and averages you mention earlier. It depends what type of regression you need to carry out depending on what results you data gives you.

The exam boards have for the first time this year failed a student for copying the work from a website. You must investigate this task for yourself and carry out a statistical analysis. Everyone will select different samples from newspapers so will get slightly different results. How to do a scatter diagram and why it is useful but i would hope you have been taught all these by your maths teacher. I can't actually tell you what to do this is against all exam board guidelines but i hope these hints will help. I can tell you what is good and what needs more work but not what to do it has to be your own ideas.

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