Two Hospital Emergency Rooms Use Different Procedures for Triage of Their

Multiple Choice

Two hospital emergency rooms use different procedures for triage of their patients.We want to test the claim that the mean waiting time of patients is the same for both hospitals.The 40 randomly selected subjects from one hospital produce a mean of 18.3 minutes.The 50 randomly selected patients from the other hospital produce a mean of 25.31 minutes.Assume a $\sigma$ _a = 2.1 minutes and $\sigma$ _b = 2.92 minutes.Setup the null hypothesis to determine if there is a difference in the mean waiting time between the two hospitals.

A) µ_a - µ_b = 0
B) µ_a - µ_b $\neq$ 0
C) µ_a - µ_b > 0
D) µ_a - µ_b < 0