A more efficient technique of analysis would leave the change in tinopathy level in its raw form without grouping the data but would take in account the ordinal nature of change scores.
What test can be employed to compare the two groups if this more efficient method is used? Implement the test and provide a p-value two tailed.
Better Worse
Group 2+ 1Level No change 1Level 2Level 3Levels 4Levels 5+Levels total
Placebo 5 17 84 59 37 18 9 14 243
Sorbinil 4 21 97 50 22 16 14 14 238