![]() ![]() The scale for Web Site Rating theoretically ranges from 0 to 20, where 0 = highly unusable and 20 = highly usable. The actual range of scores is narrower, dispersing from a low of 6 to a high of 14. Those on the team who believe that the rating scale is ordinal have argued to use the mode, or most frequently occurring score, as the cut point. However, the bar chart shows that the distribution of ratings is bimodal, with one mode at 8 and the second at 12. Others have argued that the ratings should probably be considered a scale variable and that the median would be a useful cut point. After some discussion, the team decides that randomness will be tested with respect to all three cut points: the median and both modes. |
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Bar Chart of the Test Variable |