LQ4 - I E 27 Fourth Long Quiz(THV THW 2008 September...

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2008 September 15 (1:00 PM – 4:00 PM) General Instructions: 1. You may use only pens with Black or Blue ink; otherwise only 50% of score is recorded. 2. Students caught cheating will automatically get a grade of 5.0 in this course. 3. Do not round off intermediate values. Final answers should be given in exactly 5 significant digits. 4. Box final answers. Should there be ambiguity on what your final answer is, you stand to lose all the points in that item. 5. Late papers will receive a 1-point penalty for every minute late. 6. Use of cell phones is prohibited. 7. Use only the right side of your bluebook. Use the left side for scratch. The teacher will not check stuff written on the left side of the bluebook. 8. No borrowing of calculators between students. In case two students are caught sharing a calculator, teacher will keep said calculator for the duration of the test. 9. Insert questionnaire in bluebook after the test. Bluebooks with no questionnaires inserted will not be checked. Highest possible score: 122/120 (102%) Passing: 71/120 (60%) I. True or False . If the statements provided are necessarily true, mark the item True. Otherwise, mark it False. (6 points - 1 point each) 1. If X and Y are independent then we can safely conclude that changes in X do not cause changes in Y. 2. If the conditional probability at a certain point P(X > a | Y = b) = P(X > a) then X and Y are independent. 3. The maximum value for a joint pdf is 1. 4. σ xy , if Y is identical to X, is just σ x . 5. Independent random variables always have zero correlation. 6. If X is independent from Y, and Y from Z, then X is independent from Z.
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II. Possible or Impossible. If the descriptions provided could not possibly occur within the rules governing probability distributions or mathematical laws in general, mark the item Impossible. Otherwise, mark it Possible. (10
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LQ4 - I E 27 Fourth Long Quiz(THV THW 2008 September...

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