A. Determine test statistic B. Determine critical value with k-1 degree of freedom then use the chi square to find critical value.C. Reject H0 or Fail H0. A case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn by motorcycle drivers and whetherthey 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 areindependent of helmet color.Color of HelmetBlackWhiteYellowRedBlueControls (not injured)Cases (injured orkilled)48234125165852051036840Click here to view the chi-square distribution table......Identify the null and alternative hypotheses. Choose the correct answer below.O A. Ho: Injuries and helmet color are dependentH,: Injuries and helmet color are independentB. Ho: Injuries and helmet color are independentH,: Injuries and helmet color are dependentC. Ho: Whether a crash occurs and helmet color are independentH,: Whether a crash occurs and helmet color are dependentHo: Whether a crash occurs and helmet color are dependentH1: Whether a crash occurs and helmet color are independentCompute the test statistic.(Round to three decimal places as needed.)

Solution: The observed frequency table is Black White Yellow Red Blue Row Total Controls…

Answered: A case-control (or retrospective) study…

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 computer manufacturer believes that the proportion of hardware malfunctions is different in humid climates than in dry climates. To test this claim, the manufacturer takes a random sample of 400 machines sold in Florida (humid) and 400 machines sold in Arizona (dry). The manufacturer finds that 44 of the machines in Florida and 24 of the machines in Arizona had hardware malfunctions. d. Does the evidence support the computer manufacturer's claim at the 10% significance level?
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A computer manufacturer believes that the proportion of hardware malfunctions is different in humid climates than in dry climates. To test this claim, the manufacturer takes a random sample of 400 machines sold in Florida (humid) and 400 machines sold in Arizona (dry). The manufacturer finds that 44 of the machines in Florida and 24 of the machines in Arizona had hardware malfunctions. Calculate the value of the relevant test statistic. Compute the p-value. Does the evidence support the computer manufacturer's claim at the 10% significance level?
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