You are not expected to write long essays where

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You are not expected to write long essays where explanations or descriptions are required, and note-form answers are acceptable. However, clear and accurate language, both mathematical and written, is expected and marked. 1
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ST102 Elementary Statistical Theory (LT0 examination) Key steps to improvement The most important thing you can do is answer the question set! This may sound very simple, but these are some of the things that candidates did not do. Remember: Always show your working. The bulk of the marks are awarded for your approach, rather than the final answer. Write legibly! Keep solutions to the same question in one place. Avoid scattering your solutions randomly throughout the answer booklet — the Examiners will not appreciate having to spend a lot of time searching for different elements of your solutions. Where appropriate, underline your final answer. Do not waste time calculating things which are not required by the Examiners! Using the commentary We hope that you find the commentary useful. For each question and subquestion, it gives: the answers, or keys to the answers, which the Examiners were looking for common mistakes, as identified by the Examiners. Student performance by question Question # Number of Mean Score Std. deviation attempts 1 610 14.21 6.77 2 610 20.78 5.24 Q1 Q2 0 5 10 15 20 25 Boxplots of student performance by question Marks Dr James Abdey, ST102 Lecturer, February 2017 2
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Examiners’ commentaries 2017 Examiners’ commentary 2017 ST102 Elementary Statistical Theory (LT0 examination) Specific comments on questions Question 1 (a) Feedback on this question: An unseen question – the famous ‘boy or girl paradox’. Most candidates failed to realise the simplicity of this exercise either using independence (ignoring the conditionality) or did not treat (Boy, Girl) and (Girl, Boy) as distinct observations. Credit was lost when Bayes’ theorem was used with the complete formula, but with the wrong conditional probability. Full solutions are as follows.
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  • Fall '15
  • Probability theory, Elementary Statistical Theory

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