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Field
Sample size (or number of clusters) by treatment arms
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Before
1250 control condition, 1250 excuse condition, 1250 no excuse condition. To gain statistical precision, we also report some specifications in which we pool with pilot data (N=778, with 400 in the excuse condition and 378 in the no excuse condition).
We ask our survey provider to restrict the survey to respondents who had not taken our pilot. To further ensure that our sample does not include repeat respondents, we also include a post-outcome question asking respondents whether they have taken a previous online survey that discussed the Lott study. We expect this number to be small and plan to exclude respondents who respond in the affirmative from our main specifications (though we will also report results with the entire sample).
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After
1250 control condition, 1250 excuse condition, 1250 no excuse condition. To gain statistical precision, we also report some specifications in which we pool with pilot data (N=778, with 400 in the excuse condition and 378 in the no excuse condition).
We ask our survey provider to restrict the survey to respondents who had not taken our pilot. To further ensure that our sample does not include repeat respondents, we also include a post-outcome question asking respondents whether they have taken a previous online survey that discussed the Lott study. We expect this number to be small and plan to exclude respondents who respond in the affirmative from our main specifications (though we will also report results with the entire sample).
Our survey uses Qualtrics' built-in feature to map respondents' IP to their city, which we then mention several times in the survey. This feature occasionally fails (typically when respondents are taking the survey from remote areas), resulting in no city being displayed. We will drop these respondents from all specifications.
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