In: Statistics and Probability
Part III: Confidence Intervals for μ (σ known)
a) Construct 90%, 95%, and 99% confidence intervals for μ.
b) What is happening to the width of the confidence intervals as the confidence levels increase?
Explain why this makes sense both practically and mathematically (based upon the formula).
c) Using the known standard deviation of 15 and confidence level of 95%, construct 3 different
confidence intervals based upon sample sizes 49, 100, and 225, respectively.
d) What is happening to the width of the confidence intervals as the sample sizes increase?
Explain why this makes sense both practically and mathematically (based upon the formula).