A random sample of 81 students at a university showed an average age of 25 years and a sample standard deviation of 3 years. The 95% confidence interval for the true average age of all students in the university is 23.0 to 27.0. 24.5 to 25.5. 24.3 to 25.7. 20.0 to 30.0.
Added by Teresa T.
Step 1
- Sample mean (\( \bar{x} \)) = 25 years - Sample standard deviation (\( s \)) = 3 years - Sample size (\( n \)) = 81 Show more…
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