Contaminated water: Polychlorinated biphenyls (PCBS) are a group of synthetic oil-like chemicals that were at one time widely used as insulation in electricalequipment and were discharged into rivers. They were discovered to be a health hazard and were banned in the 1970s. Assume that water samples are beingdrawn from a river in order to estimate the PCB concentration. Suppose that a random sample of size 64 has a sample mean of 1.93 parts per billion (ppb).Assume the population standard deviation is o = 0.22 ppb.Part: 0 / 3Part 1 of 3(a) Construct a 98% confidence interval for the PCB concentration. Use tables or technology. Round your answers to at least two decimal places.The confidence interval is ( ,D

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Answered: Part 1 of 3 (a) Construct a 98%…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Part 1 of 3 (a) Construct a 98% confidence interval for the PCB concentration. Use tables or technology. Round your answers to at least two decimal places. The confidence interval is ( D.