- Hypothesis Testing
- Frequentist Inference
- Confidence Interval
Confidence Interval for Mean
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Average electric usage was studied. A previously known population standard deviation was 450 KWH. A sample of 81 houses was studied and found to have a mean of 1858 KWH.
Find the 95% confidence interval for the true mean.
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The formula for a proportion confidence interval is:
mean ± z * standard deviation / square ...
The 95% confidence interval for the true mean is determined.