Experiment 49

Within-subjects t-test
2-way split-plot Analysis of Variance
Applied Psychology

The legibility of two new designs for traffic signs is tested. It is hypothesised that design A will be more easy to read than design B. Each sign is mounted on the same stretch of motorway. Twelve drivers are recruited. Six are tested on design A first and design B second, six on design B first and design A second. The distance at which each driver can reliably read the sign when travelling at 50 miles per hour is assessed.

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