Experiment 45

Within-subjects t-test
Wilcoxon matched-pairs signed-ranks test

It is predicted that faces which are familiar will be perceived as being more friendly than faces which are unfamiliar. A set of 100 photographs of faces is obtained. Ten participants rate this complete set for "friendliness" using a seven-point scale. Before this, 50 of the photographs are used in a 'warm-up task' where the participant has to sort them according to sex. The mean rating for the sorted and unsorted photos is computed for each participant.

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