Acase-contol (or retrospective)ady was condded to ivostigate a relasonship betwe
ID: 3313336 • Letter: A
Question
Acase-contol (or retrospective)ady was condded to ivostigate a relasonship between the colors of helmets worn by motoryte dnvers and whether table. Using a 001 sgnificance level, test the claim that injuries are independent of helmet color aro riuedorkled in acrash, Resis are gven in the acompanyng Color of Heimet Cases (njured or killed) densty te null and atemative hypotheses Choose the correct answer below OA. Ho: Injuries and heimet color are independent H: Injuries and heimet color are dependent My: whether a crash occurs ard helmet color are dependent OB- :Whether a crash oocurs and helmet color are independent O C. Ho: Whether a crash oocurs and helmet color are independent HWhether a crash oocurs and helmet color are dependent D. mines and hemet color are dependent H Injuries and heimet color are independent Compute the test statistic Round to three decimal places as needed. Find the critical values) (Round to three decimal places as needed. Use a comma to separate answers as needed Cick to select your answers).Explanation / Answer
The statistical software output for this problem is:
Contingency table results:
Rows: var7
Columns: None
Chi-Square test:
Hence,
Hypotheses: Option A is correct.
Test statistic = 11.600
Critical value = 13.277
Black White Yellow Red Blue Total Controls 487 375 27 163 51 1103 Cases 211 107 8 70 25 421 Total 698 482 35 233 76 1524