Results 1 to 4 of 4

Math Help - Can someone please check my answers?

  1. #1
    Junior Member
    Joined
    Oct 2008
    Posts
    25

    Can someone please check my answers?

    I am very strong in math except for in 1 area and that's probabilities. Is there anyone who can please check my answers for me and tell me if I am close or way off base? Thanks in advance!


    • Ten percent of adults say oatmeal raisin is their favorite cookie. You randomly select 12 adults and ask each to name his or her favorite cookie.



    • The two major criteria for a binomial probability experiment are independence and two possible outcomes. Explain how this experiment meets each these two criteria.


    Every answer will either be a success (they like oatmeal raisin cookies) or a failure (they donít like oatmeal raisin cookies). For independence, the probability of success remains constant for the entire experiment because the answer will either be oatmeal raisin or something else.


    • What is the value of :

    i.n? __________12____________

    ii.p? __________0.1____________

    iii.q? _________0.9_____________


    c. What is the probability that exactly 3 of the 12 adults surveyed will say their favorite cookie is oatmeal raisin? (You may use the table)



    0.085



    d. What is the probability that 3 or less adults will say oatmeal raisin is their favorite cookie?
    (You may use the table)
    0.282+0.377+0.230+0.085 = 0.974
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Mar 2008
    Posts
    934
    Thanks
    33
    Awards
    1
    Quote Originally Posted by ezwind72 View Post
    I am very strong in math except for in 1 area and that's probabilities. Is there anyone who can please check my answers for me and tell me if I am close or way off base? Thanks in advance!


    • Ten percent of adults say oatmeal raisin is their favorite cookie. You randomly select 12 adults and ask each to name his or her favorite cookie.



    • The two major criteria for a binomial probability experiment are independence and two possible outcomes. Explain how this experiment meets each these two criteria.


    Every answer will either be a success (they like oatmeal raisin cookies) or a failure (they donít like oatmeal raisin cookies). For independence, the probability of success remains constant for the entire experiment because the answer will either be oatmeal raisin or something else.


    • What is the value of :

    i.n? __________12____________

    ii.p? __________0.1____________

    iii.q? _________0.9_____________


    c. What is the probability that exactly 3 of the 12 adults surveyed will say their favorite cookie is oatmeal raisin? (You may use the table)



    0.085



    d. What is the probability that 3 or less adults will say oatmeal raisin is their favorite cookie?
    (You may use the table)
    0.282+0.377+0.230+0.085 = 0.974
    In the first part, the reason the trials are independent is that the 12 adults are chosen "at random". The implication is that this means their responses are independent. (You could argue to the contrary. It all depends on what is meant by "at random".)

    Your responses on parts c and d are correct.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Oct 2008
    Posts
    25
    Cool! Thanks! I understand what you are saying, that makes much more sense than what I read in the book!
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Jul 2009
    Posts
    593
    Thanks
    4
    In the first part, the reason the trials are independent is that the 12 adults are chosen "at random". The implication is that this means their responses are independent. (You could argue to the contrary. It all depends on what is meant by "at random".)
    That's not quite correct. The "at random" I suppose allows for independence, but what they are asking is that an individuals response on one experiment (the experiment being you asking them whether they like Oatmeal raisin or not) is not dependent on the questions you have gotten previously.

    Each individual question you are asking is an independent Bernoulli trial with one of two outcomes: a yes or a no (or 0 and 1 if we're setting up random variables). This is the answer the instructor would be looking for, although you certainly can form it as: the probability of success in one trial, is not changed with subsequent trials.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. I want check my answers
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: March 16th 2010, 08:40 AM
  2. check my answers plz
    Posted in the Calculus Forum
    Replies: 3
    Last Post: February 28th 2009, 06:06 PM
  3. Please check my answers
    Posted in the Algebra Forum
    Replies: 1
    Last Post: July 19th 2008, 02:48 AM
  4. Please check my answers
    Posted in the Calculus Forum
    Replies: 3
    Last Post: May 26th 2006, 07:53 AM
  5. I just want to check my answers, can you help me out?
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: April 27th 2005, 07:49 AM

Search Tags


/mathhelpforum @mathhelpforum