Results 1 to 3 of 3

Math Help - stratified sampling

  1. #1
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897

    stratified sampling

    hi, this is my question:

    a factory has 70 employees.
    A) Explain how you could obtain a random sample of 15 employees from this factory?

    would this be alright to do:
    35/70 X 15= 7.5 = 8 people
    35/70 X 15= 7.5 = 8 people
    8+8 =16 so then i would -1 away from one of them so it makes 15?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by andyboy179 View Post
    hi, this is my question:

    a factory has 70 employees.
    A) Explain how you could obtain a random sample of 15 employees from this factory?

    would this be alright to do:
    35/70 X 15= 7.5 = 8 people
    35/70 X 15= 7.5 = 8 people
    8+8 =16 so then i would -1 away from one of them so it makes 15?
    You are not providing enough information.

    It appears you have two strata of size 35, so flip a coin if it comes up heads use a (8,7) sample and if tails a (7,8) sample.

    Or if it is believed that one strata has a greater variance take a sample of size 8 from that strata and 7 from the other.

    CB
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Oct 2008
    From
    Bristol, England
    Posts
    897
    Quote Originally Posted by CaptainBlack View Post
    You are not providing enough information.

    It appears you have two strata of size 35, so flip a coin if it comes up heads use a (8,7) sample and if tails a (7,8) sample.

    Or if it is believed that one strata has a greater variance take a sample of size 8 from that strata and 7 from the other.

    CB
    hi, sorry i haven't posted in hours my account wouldn't let me post for some reason and it now says i have no posts.

    anyways, i understand now thanks alot for the help!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Probability Sampling and Sampling Methods
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: March 16th 2011, 04:41 AM
  2. Stratified vs. Cluster Sampling
    Posted in the Statistics Forum
    Replies: 0
    Last Post: October 28th 2010, 01:54 PM
  3. stratified sampling
    Posted in the Statistics Forum
    Replies: 2
    Last Post: May 29th 2010, 04:32 AM
  4. Sampling
    Posted in the Statistics Forum
    Replies: 1
    Last Post: April 22nd 2010, 11:28 PM
  5. Stratified Sampling
    Posted in the Statistics Forum
    Replies: 4
    Last Post: March 17th 2008, 10:31 AM

Search Tags


/mathhelpforum @mathhelpforum