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Project Maths Paper Two - 95% Confidence Interval

  • 09-06-2012 07:17PM
    #1
    cianserian
    Registered Users, Registered Users 2 Posts: 14 ✭


    Hi,

    Does anybody know for sure how to do out the 95% confidence interval? It seems to be dumbed down from the old papers, so now are we just meant to use 1/√n as the margin or error and add and subtract that from the mean now?

    Any help would be appreciated.
    Tagged:


Comments

  • #2
    K_1
    Closed Accounts Posts: 326 ✭✭K_1


    sample proportion = p^
    population proportion = p
    Margin of error = 1/rootn where n = sample size

    p^ - 1/rootn < p < p^ + 1/rootn


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