Hypothesis
1: “Novices can perform the task.”
•Error is minimal for the top 7 documents and increases
rapidly after the top 7 documents for both displays.
•Novice
users can use the Cluster Bulls-Eye and RankSpiral displays to select highly relevant documents, especially
the top 7 documents.
Hypothesis
2: “RankSpiral outperforms Cluster Bulls-Eye.”
•8
of the 9 subjects performed the task faster using the RankSpiral.
Average time
difference was 7.89 seconds.
The one-sided T-test value is
0.033, which is significant at the 0.05 level.
•7
out of 9 subjects performed the task more effectively using the
RankSpiral.
Average “relevance
score” difference is 0.034.
The one-sided T-test value is
0.037, which is significant at the 0.05 level.
Hypothesis
3: “Distance from center dominant cue.”