Answered: A case-control (or retrospective)…

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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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

0.05

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

	Color of Helmet
	Black	White	Yellow	Red	Blue
Controls (not injured)	459	343	31	161	94
Cases (injured or killed)	204	109	7	69	44

Compute the test statistic. (round three decimal places)

Find the critical value(s). (round three decimal places)

What is the conclusion based on the hypothesis test?

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