A case-control (or retrospective) study was conducted to investigate a relations

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. Identify the null and alternative hypotheses. Choose the correct answer below. A. H_0: Injuries and helmet color are dependent H_1: Injuries and helmet color are independent B. H_0: Whether a crash occurs and helmet color are independent H_1: Whether a crash occurs and helmet color are dependent C. H_0: Injuries and helmet color are independent H_1: Injuries and helmet color are dependent D. H_0: Whether a crash occurs and helmet color are dependent H_1: Whether a crash occurs and helmet color are independent

Explanation / Answer

Solution: (C) Its answer is C. becasue The null hypothesis states that a population parameter is equal to a value. The null hypothesis is often an initial claim that researchers specify using previous research or knowledge. ... The alternative hypothesis is what you might believe to be true or hope to prove true

We always need to prove null hypothesis wrong.

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