Results 1 to 2 of 2

Math Help - Selecting the Sample Size...Please help!

  1. #1
    Newbie
    Joined
    Nov 2012
    From
    New York
    Posts
    3

    Selecting the Sample Size...Please help!

    Suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpolluted area and the other in an area subject to heavy air pollution. If you wish your estimate to be correct to the nearest 0.1 pH, with probability near 0.90, approximately how many rainfalls (pH values) would have to be included in each sample? (Assume that the variance of the pH measurements is approximately 0.25 at both locations and that the samples will be of equal size. Round your answer up to the nearest whole number.)

    Please help!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,648
    Thanks
    601

    Re: Selecting the Sample Size...Please help!

    Hey Jessicasamide.

    I responded in another duplicate thread.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: December 20th 2012, 05:35 AM
  2. sample size
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: May 28th 2009, 10:35 PM
  3. sample size?
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: March 17th 2009, 06:54 PM
  4. Sample Size
    Posted in the Statistics Forum
    Replies: 1
    Last Post: December 9th 2008, 07:26 PM
  5. sample of size
    Posted in the Statistics Forum
    Replies: 0
    Last Post: January 31st 2007, 11:00 AM

Search Tags


/mathhelpforum @mathhelpforum