Zagat surveys airline customers on a 30 point satisfaction scale measuring comfort, service, and food for both domestic and international flights. The Excel file Zagat.xlsx contains survey results that were recently collected showing the average scores for various airlines.
a. Calculate the correlation coefficient for this sample.
b. Using α = 0.01, perform a hypothesis test to determine if the correlation coefficient is greater than zero.
c. What conclusions can be drawn based on these results?