You would like to construct a 99% confidence interval to estimate the population mean PCB (Polychlorinated biphenyl) level in white croaker fish from the SanFrancisco Bay. The random sample we select has a mean of 629 parts per million and a standard deviation of 54 parts per million.(a) What is the best point estimate, based on the sample, to use for the population mean?O parts per million(b) For each of the following sampling scenarios, determine which distribution should be used to calculate the critical valuefor the 99% confidence interval for the population mean.(In the table, Z refers to a standard normal distribution, and t refers to at distribution.)Could useSampling scenarioZUncleareither Z or tThe sample has size 19, and it is from a normally distributedpopulation with an unknown standard deviation.The sample has size 105, and it is from a non-normally distributedpopulation.The sample has size 90, and it is from a non-normally distributedpopulation with a known standard deviation of 51.

Solution: Given information: x = 629 ppm Sample mean s = 54 ppm Sample stadnard deviation

Answered: popu the Francisco Bay. The random…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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