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Math Help - constructing a confidence interval please help

  1. #1
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    constructing a confidence interval please help

    Using the given degree of confidence and sample data to construct a confidence interval for the population mean u. Assume that the population has a normal distribution.
    n=10
    xbar=8.7
    s=3.3
    95% confidence
    Last edited by mr fantastic; June 20th 2009 at 11:45 PM. Reason: Restored question deleted by OP
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  2. #2
    Super Member Random Variable's Avatar
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    We the fact that  T = \frac {\bar{X} - \mu}{S / \sqrt{n}} follows a t-distribution with n-1 degrees of freedom.

     \bar{x} \ \pm \ t_{(\alpha / 2, n-1)}\Big(\frac{s}{\sqrt{n}}\Big)

    \Big[8.7 - t_{(0.025, 9)}\Big(\frac{3.3}{\sqrt{10}}\Big), \ 8.7 + t_{(0.025, 9)}\Big(\frac{3.3}{\sqrt{10}}\Big)\Big]
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