In addition to well known sources of bias inherent in mail surveys, the occurrence of respondents' bias is suggested. In an empirical study 16.7% of returned questionnaires were answered by someone other than the addressees, which produced a significant increase in the percentage of female respondents. The replies of the selected and of the self-selected respondents were significantly different on 8 out of 11 behavioral measures.
A Hebrew version of the Brook Test was used as an unbiased, non‐suggestive instrument to measure the difference in interests between boys and girls aged 14–18 (grade 9–12). The largest difference (one standard deviation) was in technical interest.
A group of 166 adults from four occupations was used to cross‐check the results. In this group the interests related much more to the subjects' occupations than to their sex.
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