Answered: 356 35 156 100 Cases (injured or…

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 case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a

0.01

significance level, test the claim that injuries are independent of helmet color.

	Color of Helmet
	Black	White	Yellow	Red	Blue
Controls (not injured)	471	356	35	156	100
Cases (injured or killed)	210	109	9	66	49

Click here to view the chi-square distribution table.

Identify the null and alternative hypotheses. Choose the correct answer below.

H0:

Injuries and helmet color are dependent

H1:

Injuries and helmet color are independent

H0:

Whether a crash occurs and helmet color are dependent

H1:

Whether a crash occurs and helmet color are independent

H0:

Injuries and helmet color are independent

H1:

Injuries and helmet color are dependent

Your answer is correct.

H0:

Whether a crash occurs and helmet color are independent

H1:

Whether a crash occurs and helmet color are dependent

Compute the test statistic.

nothing

(Round to three decimal places as needed.)

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