[39751,68; 44248,32]

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.2: Arithmetic Sequences
Problem 51E
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The annual income of the 160 notaries in a large city is
a variable obeying a normal distribution. To estimate the
average annual income of notaries in this city, we take
without replacement a sample of 10 notaries and we find, in
this sample, an average annual income of $42,000 with a
sample standard deviation s = $4,000. Construct a confidence
interval at the 90% confidence level to estimate the
average annual income of notaries in this city.

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Transcribed Image Text:[39751,68; 44248,32]
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