A case control or retrospective study was conducted to

Last updated: 7/7/2023

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 Helmot 9 Black White Yellow 491 33 203 8 Controls not injured Cases Injured or killed Click here to view the chi square distribution table 352 106 VA Mo injunes and neimet color are independent H Injuries and helmet color are dependent OB Ho Whether a crash occurs and helmet color are dependent H Whether a crash occurs and helmet color are independent OC Ho Injuries and helmet color are dependent H Injuries and helmet color are independent Compute the test statistic Red 160 68 OD Ho Whether a crash occurs and helmet color are independent H Whether a crash occurs and helmet color are dependent Round to three decimal places as needed Find the critical value s Blue 75 36 Round to three decimal places as needed Use a comma to separate answers as needed What is the conclusion based on the hypothesis test