Abstract
An experiment using a 3 × 3 × 3 Latin square design tested the effects of the number of data points and type of statistical display on time spent answering questions about the information. The design allowed within-subject comparisons of main effects, and the procedure was administered by a Macintosh computer. The results, that tables and graphs are more efficiently processed than text presentation of the same data, partially confirm earlier studies that used information recall as the dependent variable, but suggest the time variable is a more realistic measure of cognitive processing effort.
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