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Textbook Expert
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12 Nov 2021

Given information

The sample size is 100. The sample mean and sample standard deviation is 23.6 and 7 hours respectively. The population is normally distributed.

Step-by-step explanation

Step 1.

The error bound E is calculated as:

   

For a 90% confidence interval, the two tailed critical z value is 1.645. The population standard deviation is estimated to be equal to the sample standard deviation and the sample size is 100.

Therefore, it follows:

   

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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

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