Results 1 to 3 of 3

Math Help - Statistics home work problems

  1. #1
    JadaRalen
    Guest

    Statistics home work problems

    1) State the main points of the Central Limit Theorem.
    2) Why is the population shape of concern when estimating a mean? What does sample size have to do with it?
    3)A random sample of 10 minature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were
    3.087 3.131 3.241 3.270 3.353 3.400 3.411 3.437 3.477

    a) Construct a 90 percent confidence interval for the true mean weight. b) What sample size would be necessary to estimate the true weight with an error of +0.03 grams with 90 percent confidence? c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.

    4) In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive. a) construct a 95 percent confidence interval for the population proportion of positive drug tests. b) why is the normality assumption not a problem, despite the very small value of p?
    Last edited by JadaRalen; March 5th 2008 at 02:18 PM.
    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 JadaRalen View Post
    1) State the main points of the Central Limit Theorem.
    This is asking you to paraphrase the staement of the central limit theorem.
    Consult your notes or this.

    RonL
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by JadaRalen View Post
    1) State the main points of the Central Limit Theorem.
    2) Why is the population shape of concern when estimating a mean? What does sample size have to do with it?
    3)A random sample of 10 minature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were
    3.087 3.131 3.241 3.270 3.353 3.400 3.411 3.437 3.477

    a) Construct a 90 percent confidence interval for the true mean weight. b) What sample size would be necessary to estimate the true weight with an error of +0.03 grams with 90 percent confidence? c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.

    4) In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and found that 1,143 were positive. a) construct a 95 percent confidence interval for the population proportion of positive drug tests. b) why is the normality assumption not a problem, despite the very small value of p?
    deja vu.

    Thread closed.
    Last edited by mr fantastic; April 22nd 2009 at 02:57 AM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. i need help with my 7th grade home work.
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 30th 2009, 05:16 PM
  2. Statistics Take Home Test Problem
    Posted in the Statistics Forum
    Replies: 2
    Last Post: February 4th 2009, 09:22 PM
  3. math home work help
    Posted in the Algebra Forum
    Replies: 1
    Last Post: September 11th 2008, 07:07 AM
  4. urgent Home Work.Statistics & Probability
    Posted in the Statistics Forum
    Replies: 0
    Last Post: November 7th 2007, 10:52 AM
  5. home work #3 plz help ASAP
    Posted in the Statistics Forum
    Replies: 8
    Last Post: June 24th 2006, 08:46 PM

/mathhelpforum @mathhelpforum