2. Consider the network for car diagnosis shown in the figure above.a. Extend the network with the Boolean variables IcyWeather and StarterMotor .b. How many independent probability values do your network tables contain? Write the values on the network you created for each variable. RadioBatteryIgnitionStartsMovesGasFigure 2 - A Bayesian network describing some features of a car's electrical systemand engine. Each variable is Boolean, and the true value indicates that thecorresponding aspect of the vehicle is in working order.

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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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2. Consider the network for car diagnosis shown in the figure above.

a. Extend the network with the Boolean variables IcyWeather and StarterMotor .
b. How many independent probability values do your network tables contain?
Write the values on the network you created for each variable.

Radio
Battery
Ignition
Starts
Moves
Gas
Figure 2 - A Bayesian network describing some features of a car's electrical system
and engine. Each variable is Boolean, and the true value indicates that the
corresponding aspect of the vehicle is in working order.

Expert Solution

Step 1

There are two ways for addiing the variable into an existing net. Formally variables must be inserted into the variable ordering and the network creation process should be restarted from the point where the first new variable appears. Informally, one does not establish a network by following a specific order. Instead, one should consider which variables are direct causes or influences on which others, and then construct local parent/child graphs accordingly. It's usually simple to figure out where the new variable belongs in such a structure, but one must be cautious of any downstream induced dependencies.

(a) Because IcyWeather is not affected by any car-related variables, it does not require parents. It has a direct impact on

the starting motor and the battery StarterMotor is a must for all Starts.

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