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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
14 Dec 2021

Given information

Average number of hours they spend watching television each month i.e. Sample mean,  

Standard deviation of number of hours they spend watching television each month i.e. Sample standard deviation,  

Number of Americans surveyed,  

Step-by-step explanation

Step 1.

99% confidence means  

z-value at 99% confidence is -

 

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