Polychlorinated biphenyls (PCBs) are a group of synthetic oil-like chemicals that were at one time widely used as an insulation in electrical equipment and were discharged into rivers.  They were discovered to be a health hazard, and were banned in the 1970s.  Assume that water samples are being drawn from a river in order to estimate the PCB concentration.  Suppose that a random sample of size 60 has a sample mean of 1.96 parts per billion (ppb).  Assume that the population standard deviation is 0.36 ppb. Construct a 95% confidence interval for the PCB concentration.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.