This assignment is designed to:
This is a mathematical homework assignment. Show your work. Be clear and concise. Type your assignment.
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[10 points: 2 for the first, 3 each for the second and third parts]
Let's begin with the same sample space $\Omega$ we have been using in class: Let $\Omega$ be the set of all outcomes defined by three successive coin flips. Assume that the coin is fair and that the distribution over all singleton events (events containing one outcome) is uniform. Let the event $D$ be the set of all outcomes in which the second flip is a head. Let the event $E$ be the set of all outcomes in which the final flip is a tail.
[10 points]
(Adapted from: Manning & Schuetze, p. 59, exercise 2.3)
Compute the probability of the event 'A period occurs after a three-letter word, and this period indicates an abbreviation (not an end-of-sentence marker)'.
[60 points; 20 per sub‐problem]
(Adapted from: Manning & Schuetze, p. 59, exercise 2.1)
Use the Set Theory Identities and Axioms of Probability Theory to prove each of the following five statements. Develop your proof first in terms of sets and then translate into probabilities; use set theoretic operations on sets and arithmetic operators on probabilities. Be sure to apply good proof technique: justify each step in your proofs; set up your proofs in two-column format, with each step showing a statement on the left and a justification on the right. Remember that in order to invoke an axiom as justification, you must first satisfy the conditions / pre-requisites of the axiom. See the proofs on the example proofs page.
[10 points]
[10 points]
Apply the definition of conditional probability to prove Bayes’ Law. Use the same standard of proof as in problem #1 above.
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