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Math Help - plz do't say anything just solve these questions. thanks

  1. #1
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    plz do't say anything just solve these questions. thanks

    Question#
    (a)The mean and standard deviation for the quality grade-point averages of a random sample 36 college seniors are calculated to be 2.6 and 0.3, respectively. Find the 95% confidence interval for the mean of the entire senior class.

    (b)In a random sample of 500 people eating lunch at a hospital cafeteria on various Fridays, it was found that x = 160 preferred seafood. Find a 90% confidence interval for the actual proportion of people who eat seafood on Fridays at this cafeteria.

    Question#2.

    (a)Hinton Press hypothesizes that the average life of its largest web press is 14,500 hours. They know that the standard deviation of press life is 2,100 hours. From a sample of 25 presses, the company finds a sample mean of 13,000 hours. At a 0.01 significance level, should the company conclude that the average life of the presses is less than the hypothesized 14,500 hours?

    (b)An advertising executive thinks that the proportion of consumer who has seen his company’s advertising in news papers is 0.65 .The executive wants to estimate the consumer population proportion to with in ±0.05 and have 98 percent confidence in the estimate. How large a sample should be taken?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by nisoo-1 View Post
    Question#
    (a)The mean and standard deviation for the quality grade-point averages of a random sample 36 college seniors are calculated to be 2.6 and 0.3, respectively. Find the 95% confidence interval for the mean of the entire senior class.
    See here

    And if you want our help you have to accept it on our terms, so subject lines like: "plz do't say anything just solve these questions. thanks" just put our backs up.

    RonL
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  3. #3
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    Sorry Sir

    I am sorry sir.
    These question also posted by someone and someone replied and did not solve complete question . I did not satisfied with answer therefore I posted that type of words.
    Again sorry.
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by nisoo-1 View Post
    I am sorry sir.
    These question also posted by someone and someone replied and did not solve complete question . I did not satisfied with answer therefore I posted that type of words.
    Again sorry.
    If you see an answer that you don't understand ask in that thread for
    more explanation.

    RonL
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  5. #5
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    plz try to solve Q#1(b) and Q#2(a),(b)

    plz Sir try to solve Q#1(b) and Q#2(a),(b). thanks
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  6. #6
    Grand Panjandrum
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    Quote Originally Posted by nisoo-1 View Post
    Pl Sir try to solve Q#1(b) and Q#2(a),(b). thanks
    Please show us what you have done, or tell us what you don't understand
    about the question.

    (I don't need to try to solve them I know how to, the question is are you
    going to learn how to? We cannot help if we don't know what your difficulties are.
    We are not here to do you homework for you but to help you learn how to do it yourself)

    RonL
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  7. #7
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    i am also working on such type of questions in these days any how if you wanted to confirm the answers of these questions are follow as

    1a) 2.6,0.098
    1b) 0.32,0.3543.
    2a) -3.5714
    2b) 547 app

    if you are facing any problem or any step or any formula you can reply me.

    and dont use such type of words again"plz do't say anything..."because any one who answer our question we should respect him and thankful to him.
    Last edited by m777; June 17th 2007 at 12:42 PM.
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