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Math Help - statistics; very basic

  1. #1
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    statistics; very basic

    Suppose that you have a fair coin, and you label the head side 1 and the tail side 0. Now, fake flipping the coin 2 times and write down the sampling distribution of the sample means. Repeat flipping the coin 4 times and 10 times.

    What is it asking? The result in the book is

    n=2 p=0.5
    x P(X=x)
    0 0.25
    1 0.50
    2 0.25

    What does that mean? Thanks a lot.
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  2. #2
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    Quote Originally Posted by 0123 View Post
    Suppose that you have a fair coin, and you label the head side 1 and the tail side 0. Now, fake flipping the coin 2 times and write down the sampling distribution of the sample means. Repeat flipping the coin 4 times and 10 times.

    What is it asking? The result in the book is

    n=2 p=0.5
    x P(X=x)
    0 0.25
    1 0.50
    2 0.25

    What does that mean? Thanks a lot.
    Flipping the coin twice gives you only one possibility of getting a 0 and 0.

    Flipping the coin twice gives you two possibilities of getting a 0 and 1: (0 and 1) and (1 and 0)

    Flipping the coin twice gives you only one possibility of getting a 1 and a 1.

    So there are 4 possible results, thus the probability of getting two 0's is 1/4, the probability of getting a 0 and a 1 is 2/4, and the probability of getting two 1's is 1/4.


    Now what are all the possible results for flipping the coin 4 times? etc.

    -Dan
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  3. #3
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    Shall I use like combinations? How can I know how many combinations of 1s I can find? And what-in the previous post- then it means x=0,1,2 with written next 0.25, 0.5, 0.25
    Like 2 means 0,1 and 1,0 ?

    I am sorry. I am not able to understand all this stuff. Thank you for helping.
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