what percent do not know what should you include in a summary of a survey should don't know data be included in summaries when quoting surveys should people say what they don't know when do not know included when reporting survey results should do not know be included in summaries should do not know include in survey results should do not know include in summaries of survey results? should don't know be included in summaries or surveys should do not know included in surveys do not know percentage should don't know be included in a research report should do not know be included when reporting should don't know be included when reporting on the survey results why is 'do not know' used in survey statistics does do not know include the survey do not know when reporting why is do not know included in a summary? which statement is not included in a survey summary should do not know be included