Answered: A software test program produces…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

A software test program produces several reports about the errors and warnings found in the software code. A software analyst needs to calculate the probability that an overflow error occurs given that a memory-size warning exists in the report P(Over flow Error| memory-size Warning). The following Bayesian network shows the dependencies between three warnings (w1, w2, w3) and the overflow error (e), which are all represented as Boolean random variables.

Calculate P(e|wl)
Cache warning
W
W
e
memory-size Warning
W
Over flow Error
Stack warning
P(w1) = 0.75
P(w2 | w1) = 0.2
P(w2|w1) = 0.5
P(w3|w1) = 0.7
P(w3|w1) = 0.25
P(e|w2,w3) = 0.3
P(e|w2,w3) = 0.25
P(e|w2,w3) = 0.1
P(e|w2,w3) = 0.35

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