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March 28, 2015

Homework Help: Statistics

Posted by ---- on Thursday, November 21, 2013 at 11:11am.

The standard deviation for a population is σ = 15.3. A sample of 36 observations selected from this population gave a mean equal to 74.8.
a) Make a 90% confidence interval for μ
b) Construct a 95% confidence interval for μ.
c) Determine a 99% confidence interval for μ.
d) Does the width of the confidence intervals constructed in parts a through c increase as the confidence level increases? Explain your answer

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