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Which of the following statements about sampling and estimation is most accurate? A. A confidence interval estimate consists of a range of values that bracket the parameter with a specified level of probability, 1 − β. B. A point estimate is a single estimate of an unknown population parameter calculated as a sample mean. C. Time-series data are observations over individual units at a point in time. D. Cross-sectional data are a set of values of a particular variable in sequential time periods. |