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Math Help - confidence intervals question

  1. #1
    Member
    Joined
    Jan 2009
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    London
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    92

    Question confidence intervals question

    Hi there,

    have been studying confidence intervals (CI) but I can't get this question.

    A 95% CI for a mean mu is 85.3 +/- 2.35. Find the following CI for mu.

    (a)90% (b) 99%

    I guess that I'd express the 95% explicitly with every thing I know and then use simultaneous equ. maybe to find sigma and n.

    If you could help me do one it would be much appreciated.

    Thanks, D
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  2. #2
    Newbie
    Joined
    Dec 2009
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    São Tomé
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    12

    help for the exercise

    hello dojo,
    You can find, in annexe, my point of view about the exercise.
    I hope that it will help.
    Bye!
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