Ten Business People Who Fly Frequently from Melbourne to Sydney

Ten business people who fly frequently from Melbourne to Sydney were asked to rank four airlines in terms of the quality of service. The people assigned scores using a 5-point Likert scale where: 1 = bad, 2 = poor, 3 = average, 4 = good, and 5 = excellent. The results are shown below. $\begin{array} { | c | c | c | c | c | } \hline & & { \text { Airline } } \\\hline \text { Person } & \text { A } & \text { B } & \text { C } & \text { D } \\\hline 1 & 5 & 5 & 2 & 1 \\\hline 2 & 3 & 3 & 4 & 2 \\\hline 3 & 2 & 3 & 4 & 3 \\\hline 4 & 1 & 1 & 4 & 3 \\\hline 5 & 4 & 1 & 5 & 3 \\\hline 6 & 2 & 3 & 4 & 2 \\\hline 7 & 1 & 3 & 5 & 2 \\\hline 8 & 3 & 3 & 5 & 1 \\\hline 9 & 1 & 3 & 5 & 2 \\\hline 10 & 2 & 4 & 3 & 1 \\\hline\end{array}$ Which test is appropriate if you want to compare the quality of service of the four airlines?