Introductory Combinatorics
5th Edition
ISBN: 9780136020400
Author: Richard A. Brualdi
Publisher: Prentice Hall
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Chapter 11, Problem 20E
To determine
To prove: A graphs of order n with at least
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3. Bayesian Inference – Updating Beliefs
A medical test for a rare disease has the following characteristics:
Sensitivity (true positive rate): 99%
Specificity (true negative rate): 98%
The disease occurs in 0.5% of the population.
A patient receives a positive test result.
Questions:
a) Define the relevant events and use Bayes’ Theorem to compute the probability that the patient actually has the disease.b) Explain why the result might seem counterintuitive, despite the high sensitivity and specificity.c) Discuss how prior probabilities influence posterior beliefs in Bayesian inference.d) Suppose a second, independent test with the same accuracy is conducted and is also positive. Update the probability that the patient has the disease.
Chapter 11 Solutions
Introductory Combinatorics
Ch. 11 - Prob. 1ECh. 11 -
Determine each of the 11 nonisomorphic graphs of...Ch. 11 - Does there exist a graph of order 5 whose degree...Ch. 11 - Does there exist a graph of order 5 whose degree...Ch. 11 -
Use the pigeonhole principle to prove that f1...Ch. 11 - Let be a sequence of n nonnegative integers whose...Ch. 11 - Let G be a graph with degree sequence (d1, d2,...Ch. 11 - Draw a connected graph whose degree sequence...Ch. 11 - Prove that any two connected graphs of order n...Ch. 11 - Determine which pairs of the general graphs in...
Ch. 11 - Determine which pairs of the graphs in Figure...Ch. 11 - Prove that, if two vertices of a general graph are...Ch. 11 - Let x and y be vertices of a general graph, and...Ch. 11 - Let x and y be vertices of a general graph, and...Ch. 11 - Let G be a connected graph of order 6 with degree...Ch. 11 - Let γ be a trail joining vertices x and y in a...Ch. 11 - Let G be a general graph and let G' be the graph...Ch. 11 - Prove that a graph of order n with at least
edges...Ch. 11 - Prob. 21ECh. 11 - Prob. 26ECh. 11 - Prob. 27ECh. 11 - Determine if the multigraphs in Figure 11.41 have...Ch. 11 - Which complete graphs Kn have closed Eulerian...Ch. 11 - Determine all nonisomorphic graphs of order at...Ch. 11 - Solve the Chinese postman problem for the complete...Ch. 11 - Call a graph cubic if each vertex has degree equal...Ch. 11 - * Let G be a graph of order n having at...Ch. 11 - Let be an integer. Let Gn be the graph whose...Ch. 11 - Prove Theorem 11.3.4.
Ch. 11 - Which complete bipartite graphs Km, n have...Ch. 11 - Prove that Km,n is isomorphic to Kn,m.
Ch. 11 - Is GraphBuster a bipartite graph? If so, find a...Ch. 11 - Prob. 50ECh. 11 - Prob. 51ECh. 11 - Prob. 53ECh. 11 - Which trees have an Eulerian path?
Ch. 11 - Prob. 55ECh. 11 - Prob. 56ECh. 11 - Prob. 58ECh. 11 - Prove that the removal of an edge from a tree...Ch. 11 - Prob. 60ECh. 11 - Prob. 62ECh. 11 - Prob. 63ECh. 11 - Prob. 64ECh. 11 - How many cycles does a connected graph of order n...Ch. 11 - Prob. 68E
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