Question 1122465: A recent study of 25 Orlando, FL residents revealed that they had lived in their current house for a mean of 11.5 years, with a sample standard deviation of 2.7 years.
1. What is the population mean? unknown or 11.5
2. What is the best estimate of the population mean? 11.5
3. n: 25
4. x-bar: 11.5
5. 𝜎: 2.7
6. Standard Error: 0.5400
Then I got lost here:
7. Develop a 90% confidence interval for the population mean?
distribution:
critical value:
Lower bound:
Upper bound:
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! This is a sample. The population itself is not defined, but it if is anything larger than this sample, which it likely is, then the population mean is unknown.
The best estimate is 11.5, x-bar is 11.5, s (not sigma) is 2.7, and SE is 0.54
90% CI is +/-t df=24 *SE
=+/-1.711*2.7=+/-4.62
mean +/-4.62
(6.88, 16.12) units are years
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