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Math Help - Statistics Question! Need help please!

  1. #1
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    Statistics Question! Need help please!

    Hey guys. Can anybody please help me with this statistics question? THANKS

    Question 1: On your shelf, you have four books that you are planning
    to read in the near future. Two are fictional works, containing 212 and 379
    pages, respectively, and the other two are nonfiction, with 350 and 575 pages,
    respectively.
    (a) (3 marks). Compute the population mean and standard deviation σ
    of the (parent) population of number of pages of the four books.
    (b) (8 marks). Suppose that you select a simple random sample of two
    books from the four to take on a one-week ski trip (in case you injure
    yourself). Let X denote the sample mean number of pages for the two
    books selected. Obtain the sampling distribution of X for this sampling
    method, and determine its mean and standard deviation.
    (c) (8 marks). Suppose that you randomly select one of the two fiction
    books and independently randomly select one of the two nonfiction
    books. Obtain the sampling distribution of X for this sampling method,
    and determine its mean and standard deviation.
    (d) (4 marks). Which of these two sampling methods would you prefer for
    making an educated guess about ? Why?
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    Re: Statistics Question! Need help please!

    specifically which part of the question do you not understand, or not know how to do?
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    Re: Statistics Question! Need help please!

    Hey. I need to know how to do part d). I've done all the rest. Thanks alot!!!
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  4. #4
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    Re: Statistics Question! Need help please!

    Quote Originally Posted by samishah View Post
    Hey guys. Can anybody please help me with this statistics question? THANKS

    Question 1: On your shelf, you have four books that you are planning
    to read in the near future. Two are fictional works, containing 212 and 379
    pages, respectively, and the other two are nonfiction, with 350 and 575 pages,
    respectively.
    (a) (3 marks). Compute the population mean and standard deviation σ
    of the (parent) population of number of pages of the four books.
    (b) (8 marks). Suppose that you select a simple random sample of two
    books from the four to take on a one-week ski trip (in case you injure
    yourself). Let X denote the sample mean number of pages for the two
    books selected. Obtain the sampling distribution of X for this sampling
    method, and determine its mean and standard deviation.
    (c) (8 marks). Suppose that you randomly select one of the two fiction
    books and independently randomly select one of the two nonfiction
    books. Obtain the sampling distribution of X for this sampling method,
    and determine its mean and standard deviation.
    (d) (4 marks). Which of these two sampling methods would you prefer for
    making an educated guess about ? Why?
    Do you expect us to do your assignment for you?
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    Re: Statistics Question! Need help please!

    Quote Originally Posted by samishah View Post
    Hey. I need to know how to do part d). I've done all the rest. Thanks alot!!!
    i believe the sampling method in c is better. simply put, if you took 2 random books out of the 4, you may easily get both fiction, or both non-fiction. and the fiction books have a smaller number of pages. if you selected both fiction, or both nonfiction, it won't give you an accurate picture of your population.
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