Results 1 to 4 of 4

Math Help - Hypothesis Testing need steps

  1. #1
    Newbie
    Joined
    Apr 2012
    From
    Arizona
    Posts
    5

    Hypothesis Testing need steps

    two samples of data determine if u can be 99% sure that company A makes more money than Company B

    Co A Co B
    mean 55,000 52,000
    Std Dev 5,000 3,000
    Sample size 200 400

    I started out with z= 55,000-52,000
    -----------------
    V 5,000(2) + 3,000(2)
    --------- ---------
    200 400
    Then, I get stuck?????? What do I do next to arrive at my answer?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Apr 2012
    From
    Arizona
    Posts
    5

    Re: Hypothesis Testing need steps

    No help from anyone the formula being used is _ _ 2 2
    z= x1 -x2 divided by square root s1 + s2
    -- ---
    n1 n2
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28

    Re: Hypothesis Testing need steps

    \displaystyle t_{calc}= \frac{    \bar{x_1}- \bar{x_2}     }{   \sqrt{    \frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}      }      }

    \displaystyle df = \frac{ \left(   \frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}\right)^2     }{   \left(  \frac{\left( \frac{s_1^2}{n_1}\right)^2}{n_1-1}+\frac{\left( \frac{s_2^2}{n_2}\right)^2}{n_2-1} \right)    }



    reject H_0 if  |t_{calc}|> |t_{df, 1-\alpha}|
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Apr 2012
    From
    Arizona
    Posts
    5

    Re: Hypothesis Testing need steps

    Ok I got the formula mines just didn't type out like yours. My problem is actual help with numbers when I got to step three I have 3000 divided by 5830.95 then I got 1.94365. I don't know if I'm correct or what to do next.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Hypothesis Testing
    Posted in the Statistics Forum
    Replies: 2
    Last Post: November 20th 2011, 11:36 AM
  2. Hypothesis testing
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: October 11th 2010, 02:55 PM
  3. Hypothesis Testing
    Posted in the Statistics Forum
    Replies: 8
    Last Post: January 14th 2010, 07:22 AM
  4. Testing Hypothesis
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: January 8th 2009, 01:26 AM
  5. hypothesis testing
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: May 29th 2008, 11:09 AM

Search Tags


/mathhelpforum @mathhelpforum