Results 1 to 2 of 2

Math Help - Finding t intervals

  1. #1
    Newbie
    Joined
    Apr 2008
    Posts
    4

    Finding t intervals

    I understand how to work this problem while finding Z sub alpha/2 but I can't figure out how with t sub alpha/2. The mean is unknown, as needed to be a T interval, i think, but Im not sure how to apply these numbers.
    Example:
    Find the value:
    t sub alpha/2 and n= 18 for the 99% confidence interval for the mean.


    thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by hemoglowen View Post
    I understand how to work this problem while finding Z sub alpha/2 but I can't figure out how with t sub alpha/2. The mean is unknown, as needed to be a T interval, i think, but Im not sure how to apply these numbers.
    Example:
    Find the value:
    t sub alpha/2 and n= 18 for the 99% confidence interval for the mean.


    thanks
    df = n - 1 = 17. t_{\alpha/2} = t_{0.005} = 2.898 (using http://www.anu.edu.au/nceph/surfstat...e/tables/t.php, for example).

    \bar{x} - t_{\alpha/2} \frac{s}{\sqrt{n}} < \mu < \bar{x} + t_{\alpha/2} \frac{s}{\sqrt{n}}

    where \bar{x} is the sample mean and s is the sample sd.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Finding the intervals . Urgent.
    Posted in the Calculus Forum
    Replies: 13
    Last Post: December 7th 2010, 03:37 PM
  2. Finding Intervals of increase and decrease
    Posted in the Calculus Forum
    Replies: 2
    Last Post: April 6th 2010, 10:20 AM
  3. Finding Decreasing Intervals
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 22nd 2010, 03:20 PM
  4. Replies: 1
    Last Post: January 29th 2010, 04:44 PM
  5. Finding the intervals
    Posted in the Calculus Forum
    Replies: 3
    Last Post: December 1st 2008, 08:47 PM

Search Tags


/mathhelpforum @mathhelpforum