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Math Help - Confidence interval question please help

  1. #1
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    Confidence interval question please help

    I know what to do for (A) but i have no idea what (B) is asking me... can anyone enlighten me??? BTW the interval and the answer that I got for (A) is (223.98, 224.03).. I interpret this by saying that we are 90% confident that the interval from 223.96 to 224.03 captures the true mean dimension in millimeters
    (B) confused me
    Attached Thumbnails Attached Thumbnails Confidence interval question please help-screen-shot-2013-02-06-6.19.32-pm.png  
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  2. #2
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    Re: Confidence interval question please help

    Hey asilvester635.

    Hint: Consider what the new point estimate is and whether its higher or lower.
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  3. #3
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    Re: Confidence interval question please help

    well the point estimate is 224 right?
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  4. #4
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    Re: Confidence interval question please help

    Hint: What is the sample mean and the point estimate given that mean?
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    Re: Confidence interval question please help

    from what i know the sample mean is essentially the same thing as the point estimate..... so the sample mean must be 224
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  6. #6
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    Re: Confidence interval question please help

    No that is the population mean: Did you calculate the sample mean from your set of observations? Is this number different from the quoted population mean?
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    Re: Confidence interval question please help

    Oh yes the sample mean is 224.56, so yes it's different and it's higher than the population by .56, so it drifted??????
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  8. #8
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    Re: Confidence interval question please help

    Yes it would seem that its drifting to the right.
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