Pre-lecture Quiz #3 Graded Assignment | Back to Assignment Due Sunday 01.28.18 a

Question

Pre-lecture Quiz #3 Graded Assignment | Back to Assignment Due Sunday 01.28.18 at 11:45 PM Attempts: Keep the Highest: /6 3. Question 3 Aa Aa E A confidence interval estimate is an estimate of a population parameter providing an interval that is believed (with a certain level of confidence) to contain the value of the population parameter. The confidence level is the level of confidence associated with the confidence interval estimate. If your confidence level is 92%, then if you were to employ repeated sampling and compute the confidence interval estimate for each sample, you would expect-- % of the intervals the population parameter Match each confidence interval to its corresponding equation. confidence interval for a population mean when is unknown: Confidence interval for a population proportion: confidence interval for a population mean when is known: The general form for a confidence interval: ZU/n Plwsh Player WIN 28.0,0137 ) 3.34.1 © 2004-2016 Aola. All rights reserved. e 2013 Cenonge Learning esceet as notnd, All rghes Continue without saving

Explanation / Answer

Answer to the question is as follows. Write back in case you have doubts:

A confidence interval is an interval estimate combined with a probability statement.

This means that if we used the same sampling method to select different samples and computed an interval estimate for each sample, we would expect the true population parameter to fall within the interval estimates 95% of the time.

> By the above definition 92% of the intervals, contain

1st: xbar +/- ta/2*s/sqrt(n)
2nd: p^ +/- Za/2 * sqrt( p*(1-p)/n)
3rd: xbar +/- Za/2*sigma/sqrt(n)
4th: point estimate +/- margin or error

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