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Problem

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Textbook ExpertVerified Tutor
12 Nov 2021

Given information

The sample size is now unknown. The sample mean and sample standard deviation is 23.6 and 7 hours respectively. The population is normally distributed.

The error bound is 1 hour and the confidence level is 96%.

Step-by-step explanation

Step 1.

The formula for the error bound is:

 

For a 96% confidence level, the critical value is 2.05. The error bound according to the problem is E=1 hour.

 

Square both sides of the equation:

 

 

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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

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