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An economist is interested in
studying the incomes of
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consumers in a particular
region. The population
standard deviation is known
to be $1000. A random
sample of 50 individuals
resulted in an average
income of $15000. What total
sample size would the
economist need to use for a
95% confidence interval if the
width of the interval should
not be more than $100?
A. None of the other choices
is correct
B. 1083
C. 1537
D. 385
E. 271
FUO.sh
sh the exam.
Let
20.05 =
1.645; Zo.025
== 1.960;
to.05:49
1.677; to.025:49 = 2.010
