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Math Help - t scores

  1. #1
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    t scores

    for the problem
    Find the margin of error for the 94% confidence interval for the mean blood pressure of women with n=92, xbar=114.9, stddev=13.2.

    I know the formula for the margin of error but how do you find the t-score using the t table?
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  2. #2
    MHF Contributor matheagle's Avatar
    Joined
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    I assume you're obtaining a CI for a mean.
    In that case you have n-1=91 degrees of freedom
    Now a t with 91 df is quite close to a normal percentile, which is probably what you're
    expected to use.
    However there are some nice stat calculators online, such as
    http://www.danielsoper.com/statcalc/calc10.aspx
    If I understand your question.... I get t_{91,.03}=2.204651
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