To find out how Seattle restaurant patrons feel about ban on smoking inside/public places, a pollster plans to pass out a questionnaire to those at safeway who would agree to answer the questions. What does it mean to say that there is undercoverage with this method of sampling? A) those that do not wish to fill out the questionnaire could avoid pollsters. B) those that do not go to safeway are excluded from consideration.  C) those that take the questionnaire could give false answers.

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.