The arithmetic test of the NAEP (National Assessment of Education Progress) survey was applied to a sample
Fantastic news! We've Found the answer you've been seeking!
Question:
The arithmetic test of the NAEP (National Assessment of Education Progress) survey was applied to a sample of 1,077 women between 21 and 25 years old. The average of their results was 275 points. Suppose that the standard deviation of all individual results is σ = 60 points.
a) Calculate a 95% confidence interval for the mean of the results μ of the population of young women of these ages.
b) Suppose that the same result, x ̅ = 275, comes from a sample of 250 women. Find a 95% confidence interval for the population mean μ in this case.
Related Book For
Statistics for Managers Using Microsoft Excel
ISBN: 978-0133130805
7th edition
Authors: David M. Levine, David F. Stephan, Kathryn A. Szabat
Posted Date: