Textbook ExpertVerified Tutor
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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