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.

Name: You would like to construct a 90% confidence interval to estimate the
Uploaded: 2024-03-20T07:07:12.000Z
Channel: Bartleby
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