A professor at the University of Iowa was interested in evaluating whether domestic dispute calls were more dangerous to officers than other types of calls. Collecting information on call for service and whether the call resulted in officer injury. The data is displayed in the contingency table below. Type of Call Domestic DisputeNot a Domestic DisputeOfficer InjuryNo128675 Yes245786 Using the information to complete Table 1 and answer the questions below. Table 1. Chi-square (4 points, 1 per column)CategoryObservedExpectedO – E(O – E)2(O – E)2/ENo, Domestic128 No, Not Domestic675 Yes, Domestic245 Yes, Not Domestic786 What is the scale of measurement of the dependent variable? What is the value for the chi-square? Using an alpha level of 0.05, what is the critical value?

Solution To test the hypothesis we will use Chi square distribution.

Answered: professor at the University of Iowa was…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

A professor at the University of Iowa was interested in evaluating whether domestic dispute calls were more dangerous to officers than other types of calls. Collecting information on call for service and whether the call resulted in officer injury. The data is displayed in the contingency table below.

		Type of Call
		Domestic Dispute	Not a Domestic Dispute
Officer Injury	No	128	675
	Yes	245	786

Using the information to complete Table 1 and answer the questions below.

Table 1. Chi-square (4 points, 1 per column)

Category	Observed	Expected	O – E	(O – E)²	(O – E)²/E
No, Domestic	128
No, Not Domestic	675
Yes, Domestic	245
Yes, Not Domestic	786


What is the scale of measurement of the dependent variable?
What is the value for the chi-square?
Using an alpha level of 0.05, what is the critical value?