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Math Help - Sample Random Sample Question 2

  1. #1
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    Sample Random Sample Question 2

    A Sample of size n drawn at random without replacement from a population of size N, indicated that r have a certain characteristic.

    a) Derive the variance r.
    b) Write down the 95% confidence interval for p.


    Im not sure what Dervice the varinace of r mean?

    or im not sure about part b?

    Im just uset with numbers and i cant seem to get my head around this one.
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  2. #2
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    Quote Originally Posted by morrybo View Post
    A Sample of size n drawn at random without replacement from a population of size N, indicated that r have a certain characteristic.

    a) Derive the variance r.
    b) Write down the 95% confidence interval for p.


    Im not sure what Dervice the varinace of r mean?

    or im not sure about part b?

    Im just uset with numbers and i cant seem to get my head around this one.
    My post here may help you in regards to confidence intervals: http://www.mathhelpforum.com/math-he...-question.html

    What is the special characteristic of the subset r? With no information present, I do not see how we can find the variance??
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  3. #3
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    Sorry im just going by my college exam papers.

    Heres another example of a question similar to the first one i posted.

    To Estimate the average income in a certain area, a simple random of size n is chosen without replacement from the population of size N.

    a) Derive the variance of the estimator.

    b) Obtain a 95% confidence interval for the Y(bar).
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