Results 1 to 3 of 3

Math Help - Hypothesis testing with no SAMPLE standard deviation?!

  1. #1
    Newbie
    Joined
    Dec 2009
    Posts
    2

    Hypothesis testing with no SAMPLE standard deviation?!

    Hi, I was wondering if anyone could help me. Today I had my statistics final, and the last question on the test asked us to answer (in fifteen words or fewer) what to do if we had a hypothesis test for population mean for which we not only didn't know the population standard deviation, but also the sample standard deviation. Does anyone know how (or if) you can do anything?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,763
    Thanks
    5
    I guess you have \bar X?

    But if you have the data you can do a t test, but there you need to calculate S^2.

    If you don't have normality you can do an approximate test via the central limit theorem if n is large.

    If you don't have normality and n is small I guess you can do a nonparametric test.

    You can do a lame approximation of S via range divided by four, but that is based on normality.


    SO, I don't exactly know what your instructor is getting at.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Dec 2009
    Posts
    2
    Yeah, it said sample mean was given.

    Thanks for your response. I just wanted to make sure I wasn't completely clueless about something...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 0
    Last Post: November 30th 2009, 06:16 PM
  2. standard deviation and hypothesis testing
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: September 17th 2009, 12:54 AM
  3. variance of sample mean and sample standard deviation
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: July 24th 2009, 05:20 AM
  4. Replies: 2
    Last Post: May 7th 2009, 11:29 AM
  5. Mean, Standard Deviation, and Hypothesis Testing
    Posted in the Statistics Forum
    Replies: 2
    Last Post: December 8th 2008, 01:19 AM

Search Tags


/mathhelpforum @mathhelpforum