A researcher runs a study where they measure various rich, industrialized countries on two variables: average household income and average educational attainment. They want to see which of these variables is a better predictor of expert ratings of a country's degree of political freedom. (Note: Usually we have talked about individual human beings. But here, the unit of analysis is by country. This does not affect anything regarding what test to use.) Which test will the research use to evaluate these data?

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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.