Considering the following scenario, which method would be most appropriate when calculating the margin of error for the

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Considering the following scenario, which method would be most
appropriate when calculating the margin of error for the population
mean?
An economist wants to estimate the mean per capita income (in
thousands) in a major city in Maryland. She obtains information
from 54 workers in the city and finds the mean to be
9.3 with a population standard deviation known to be
4.94 The population is assumed to be uniformly
distributed.