Results 1 to 2 of 2

Math Help - What is the point estimate for p1-p2?

  1. #1
    Newbie
    Joined
    Dec 2011
    Posts
    5

    What is the point estimate for p1-p2?

    Ok this is the last one I am struggling with. All of this is new to me just learned over the past few days but I really want to get it down. Any help will be appreciated. Thank you!

    Kelly wanted to estimate the difference between the percentages of users of automobiles who would never change car brands. She took a sample of 500 users of Toyota (100 of who said they would never switch) and 400 users of Ford(68 of who said they would never switch).

    A.) Let p1-p2 represent the two groups that use the above automobiles. What would the point estimate for p1-p2?
    B.) Construct a 97% confidence interval for the difference between proportions of all users of the two automobiles who will never switch.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    29

    Re: What is the point estimate for p1-p2?

    Try \displaystyle p_1-p_2\pm Z_{0.97}\times \sqrt{\frac{p_1(1-p_1)}{n_1}+\frac{p_2(1-p_2)}{n_2}}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: December 7th 2011, 09:53 PM
  2. Determining Point Estimate.
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: March 18th 2011, 11:51 PM
  3. Point estimate and Interval estimate
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: October 11th 2009, 09:42 AM
  4. How to find best point of estimate?
    Posted in the Advanced Statistics Forum
    Replies: 7
    Last Post: April 13th 2009, 11:42 PM
  5. Point Estimate
    Posted in the Statistics Forum
    Replies: 1
    Last Post: November 21st 2006, 12:02 PM

Search Tags


/mathhelpforum @mathhelpforum