I need to find the population of the study. I know the population of the study is the group as a whole being researched. My topic is: The average annual income of states and the average cost of a four-year college degree. What would the population of the study be? All of the states? I am just confused.

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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.