Font Readability. In the online paper “A Comparison of Two Computer Fonts: Serif versus Ornate Sans Serif” (Usability News, Issue 5.3), researchers S. Morrison and J. Noyes studied whether the type of font used in a document affects reading speed or comprehension. The fonts used for the comparisons were the serif font Times New Roman (TNR) and a more ornate sans serif font called Gigi. There were 10 substitution words used for testing the comprehensibility of the two fonts. The substitution words were inappropriate to the context of the passage and varied grammatically from the original words in the paragraphs. The following table gives the number of inappropriate words out of the 10 that were identified in the TNR and Gigi fonts by each of the 25 participants.

TNR Gigi TNR Gigi TNR Gigi 8 9 8 8 9 6 10 7 10 9 8 5 5 4 8 7 9 8 10 8 8 6 8 5 8 8 10 9 9 6 10 8 10 6 9 4 9 7 9 8 10 8 10 10 9 3 9 2 7 6 Suppose that you want to perform a hypothesis test to determine whether, on average, people have better comprehension with the TNR font than with the Gigi font. Conduct preliminary graphical data analyses to decide whether applying the paired Wilcoxon signed-rank test is reasonable. Explain your decision.