About a quarter of the world's population agrees that a number of negative statements about Jews are "probably true," according to a poll aimed at providing a statistical underpinning to the question of how widespread anti-Semitism is globally.

In the survey to be released Tuesday, which covered 101 countries plus the Palestinian territories, 26% of respondents agreed with at least six of 11 negative statements—what its sponsor called stereotypes—about Jews. The questions included "Jews are more loyal to Israel...