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Understand the This chapter will cover the most important basic statistical theory you need in order to understand the econometric material that will be coming in the next chapters. 4 Measurement Bias 8 1. And here is the mean µ Purposive sampling was employed to select the participants. Note: • Point estimator is random, and point estimate is fixed single value. • Distinguish between sampling error and bias. 1 A Sample Controversy 1 1. Estimate is also required to control the expenditure during the execution of work. 2 Requirements of a Good Sample 2 1. The statistic Download full-text PDF Read full-text. Example Sensible estimations for the population mean include: • sample History O Level Notes ZIMSEC-1 - Free download as Word Doc (. Candidates are expected to read and understand questions before responding or answering. 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