MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question

For a sample 1000 app users, the research team reports an average age of 39. If the population standard deviation is 9.5 years, what would be the upper bound for a 90% confidence interval estimate of the mean age of all users?

 
Expert Solution
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Step 1

given data 

n = 1000

x¯ = 39σ = 9.590% ci, upper bound of ci  = ?

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