NCCY5010: Statistics for Management Quiz #3

NCCY5010: Statistics for Management
Quiz #3
Instructions:
Use this worksheet to calculate the answers to the following questions, then return to the course quiz to submit your answers. You have decided to resolve scientifically a long-­‐running controversy among commuters, as to which railroad is late more often. People from Connecticut and Westchester County claim that Metro-­‐North is late more frequently, while commuters from Long Island claim that no one is late more often than the Long Island Railroad (LIRR). The Excel file for this quiz contains data you have collected from dozens of trips on each of the two commuter train lines. Perform a hypothesis test to see whether either group of commuters can claim that its train service is late more frequently than the other. Use a 0.05 probability of a Type I error. Use Excel to make your calculations. Step 1: Formulate two hypotheses Step 2: Select a test statistic Step 3: Decision rule Step 4: Calculate the test statistic and decide whether to reject. Step 5: Calculate the p-­‐value of the test and explain its meaning.