Consider a symmetric 90% confidence interval for the population mean of a normal distribution with unknown variance, constructed using a random sample of 400 observations. Which of the following changes, ceteris paribus, would shorten the length of the confidence interval by the greatest amount?
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Point and interval estimation has come up 28 times in 6 exams since 2008.
This question is on Confidence intervals, part of Point and interval estimation in Statistics.
Ranges that capture a parameter with a stated confidence level.
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Question from the DSE 2008 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.