Answer to Question #187330 in Statistics and Probability for Khalilah Spencer

Question #187330

The income of brokers in Barbados is normally distributed. A sample of 54 brokers has an

average yearly income of BD$86,000 with standard deviation of BD$12,000. Find the

98% confidence interval for the yearly mean income of Barbadian brokers.


1
Expert's answer
2021-05-07T10:34:52-0400

We have given that,

n=54n = 54

xˉ=86000\bar x = 86000

s=12000s = 12000

Confidence interval can be calculated as

CI=xˉ±zsnCI = \bar x \pm z \dfrac{s}{\sqrt n}


CI=86000±3802.72CI = 86000 \pm 3802.72


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