You would like to construct a 90% confidence interval to estimate thepopulation mean PCB (Polychlorinated biphenyl) level in white croakerfish from the San Francisco Bay. The random sample we select has amean of 644 parts per million and a standard deviation of 51 parts permillion.?(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, determinewhich distribution should be used to calculate the criticalvalue for the 90% confidence interval for the populationmean.(In the table, z refers to a standard normal distribution, andi refers to a t distribution.)Could useSampling scenarioUncleareither Z or !The sample has size 100, and it isfrom a non-normally distributedpopulation.The sample has size 14, and it isfrom a normally distributedpopulation with a known standarddeviation of 52.The sample has size 12, and it isfrom a normally distributedpopulation with an unknownstandard deviation.

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Description: You would like to construct a 90% confidence interval to estimate thepopulation mean PCB (Polychlorinated biphenyl) level in white croakerfish from the San Francisco Bay. The random sample we select has amean of 644 parts per million and a standard

Given, x=644s=51 a). The required best point estimate based on the sample to use for the population…

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You would like to construct a 90% confidence interval to estimate the population mean PCB (Polychlorinated biphenyl) level in white croaker fish from the San Francisco Bay. The random sample we select has a mean of 644 parts per million and a standard deviation of 51 parts per million. (a) What is the best point estimate, based on the sample, to use for the population mean? N parts per millien

You would like to construct a 90% confidence interval to estimate the population mean PCB (Polychlorinated biphenyl) level in white croaker fish from the San Francisco Bay. The random sample we select has a mean of 644 parts per million and a standard deviation of 51 parts per million. (a) What is the best point estimate, based on the sample, to use for the population mean? N parts per millien

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Question

You would like to construct a 90% confidence interval to estimate the
population mean PCB (Polychlorinated biphenyl) level in white croaker
fish from the San Francisco Bay. The random sample we select has a
mean of 644 parts per million and a standard deviation of 51 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
value for the 90% confidence interval for the population
mean.
(In the table, z refers to a standard normal distribution, and
i refers to a t distribution.)
Could use
Sampling scenario
Unclear
either Z or !
The sample has size 100, and it is
from a non-normally distributed
population.
The sample has size 14, and it is
from a normally distributed
population with a known standard
deviation of 52.
The sample has size 12, and it is
from a normally distributed
population with an unknown
standard deviation.

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