A marketing firm needs to replace its existing network provider and is considering three different providers. A primary consideration is the amount of system downtime. The following table contains the amount of network downtime (in hours) for the last five months for each network provider. For the Kruskal-Wallis test, the competing hypotheses are ________. A) H₀: m_A = m_B = m_C; H_A: Not all population medians are equal B) H₀: m_A = m_B = m_C; H_A: m_A ≠ m_C C)H₀: m_A = m_B = m_C; H_A: m_A ≠ m_B D)H₀: m_A = m_B = m_C; H_A: m_B ≠ m_C

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is used to compare the medians of three or more independent groups. In this case, there are three different network providers being compared. The null hypothesis states that the population medians are equal for all three providers (m1 = m2 = m3). The alternative hypothesis states that at least one population median is different from the others (not all population medians are equal). Therefore, the best choice for the competing hypotheses is A.

A Marketing Firm Needs to Replace Its Existing Network Provider