Statistics 1 Revision Notes - Mr Barton Maths
Statistics 1 Revision Notes - Mr Barton Maths
Statistics 1 Revision Notes - Mr Barton Maths
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Question 2<br />
Statistical models can be used to describe real world problems. Explain the process<br />
involved in the formulation of a statistical model.<br />
Answer<br />
Observe real world problem<br />
Devise a statistical model and collect data<br />
Compare observed against expected outcomes and test the model<br />
Refine model if necessary<br />
Question 3<br />
(a) Write down two reasons for using statistical models.<br />
(b) Give an example of a random variable that could be modelled by<br />
(i) a normal distribution,<br />
(ii) a discrete uniform distribution.<br />
Answer<br />
(a) To simplify a real world problem<br />
To improve understanding / describe / analyse a real world problem<br />
Quicker and cheaper than using real thing<br />
To predict possible future outcomes<br />
Refine model / change parameters possible Any 2<br />
(b) (i) height, weight, etc. (ii) score on a face after rolling a fair die<br />
Histograms<br />
Question 1<br />
Give a reason to justify the use of a histogram to represent these data.<br />
Answer<br />
The variable (minutes delayed) is continuous.<br />
Averages<br />
Question 1<br />
Write down which of these averages, mean or median, you would recommend the<br />
company to use. Give a reason for your answer.<br />
Answer<br />
14/04/2013 <strong>Statistics</strong> 1 SDB 43
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