Results 1 to 3 of 3

Math Help - Testing significance of difference between two averages.

  1. #1
    Newbie
    Joined
    Jan 2011
    Posts
    1

    Testing significance of difference between two averages.

    Hi all,

    Firstly, I apologise if this is in the wrong section of the forum but I know absolutely nothing about math.

    I've been asked to find several values between two mean velocities and figure out if the means are "significantly different":
    1. P value
    2. t value
    3. t crit value
    4. df


    Mean velocity A: 0.471m/s
    Mean velocity B: 0.205m/s

    (These are the means of two data sets on Excel with 40 samples in each)

    If anybody could shed some light as to what these are and how to calculate them, as simplified as possible, I'd be extremely grateful.

    Thanks in advance,
    OSNS
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Mar 2010
    From
    Florida
    Posts
    3,093
    Thanks
    5
    An arithmetic mean is calculated by adding up the 40 observations and than dividing by the number which is 40.

    \displaystyle\frac{1}{n}\sum_{i=1}^{40}x_i
    Last edited by mr fantastic; January 10th 2011 at 06:46 PM. Reason: Deleted geometric mean.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,234
    Thanks
    27
    Quote Originally Posted by OSNS View Post
    I've been asked to find several values between two mean velocities and figure out if the means are "significantly different":
    1. P value
    2. t value
    3. t crit value
    4. df


    Mean velocity A: 0.471m/s
    Mean velocity B: 0.205m/s

    (These are the means of two data sets on Excel with 40 samples in each)
    Have you seen the t-test for difference in means?

    Excel has a data analysis tool that can perform this test.

    More reading: Testing Differences Between Means
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. [SOLVED] Significance Testing for Categorical Data
    Posted in the Advanced Statistics Forum
    Replies: 4
    Last Post: September 2nd 2011, 12:52 AM
  2. Significance Testing Sample Proportions
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: May 12th 2011, 08:18 AM
  3. help - curve fitting - significance testing
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: February 7th 2011, 04:57 AM
  4. [SOLVED] Normal distribution of the difference between two averages
    Posted in the Statistics Forum
    Replies: 1
    Last Post: September 12th 2010, 10:14 PM
  5. Adding a control variable and testing for significance
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: August 4th 2009, 02:51 AM

Search Tags


/mathhelpforum @mathhelpforum