Which statement below is incorrect? Select one: A. In a survey study, we can never completely eliminate the random error, but it is possible to completely eliminate the systematic error. B. Compared to the simple random sampling, it is easier to manipulate data with the systematic random sampling. C. PACF and ACF can never have the same value. D. If a time series has an upward trend over time, it cannot be stationary.

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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.