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Thread: Statistics Marathon & Questions

  1. #76
    Executive Member Rhinoz8142's Avatar
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post








    dont you have to use the FCF ?

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by Rhinoz8142 View Post
    dont you have to use the FCF ?
    Think me and Trebla got the same answer, you have to use the n value which in this case is the n=50. (not the finite value)
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post
    Think me and Trebla got the same answer, you have to use the n value which in this case is the n=50. (not the finite value)
    but don't you use the finite correction factor since n/N = 50/250 = > 0.05. Thus using the equation sqrt(N-n/N-1).


    I could also be wrong.

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by Rhinoz8142 View Post
    but don't you use the finite correction factor since n/N = 50/250 = > 0.05. Thus using the equation sqrt(N-n/N-1).


    I could also be wrong.
    if it isn't a 1st year level of statistics then you may be right.

















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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by Rhinoz8142 View Post
    but don't you use the finite correction factor since n/N = 50/250 = > 0.05. Thus using the equation sqrt(N-n/N-1).


    I could also be wrong.
    This is needed if there is a sampling without replacement which I guess now looking at the question again is somewhat implied but not immediately obvious. If it is a sampling with replacement then what I had earlier is correct.
    Last edited by Trebla; 5 Jun 2016 at 5:27 PM.

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post










    Just read up last night that if SSR=SST then its a perfect linear relationship.

    Anyway I am taking a break from this forum for the next 1 month, got alot of work to do, so I'll look forward to bumping into you guys again in July. Just decided that I needed a break as I have been sitting in front of a computer all the time and have no social life as well.
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post
    Just read up last night that if SSR=SST then its a perfect linear relationship.

    Anyway I am taking a break from this forum for the next 1 month, got alot of work to do, so I'll look forward to bumping into you guys again in July. Just decided that I needed a break as I have been sitting in front of a computer all the time and have no social life as well.
    I broke my promise I miss this forum too much, I'm back.
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    Re: University Statistics Discussion Marathon



    I am stuck on part (iv) on how to calculate the Power of the Test. I understand what a power test is but struggle to see it in this question.

    Here is an excerpt from the Business Statistics textbook from Sharpe, De Veaux and Velleman book.

















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    Re: University Statistics Discussion Marathon

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    Re: University Statistics Discussion Marathon







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    Re: University Statistics Discussion Marathon

    We can disregard quantity in this question.
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    Re: University Statistics Discussion Marathon


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    Re: University Statistics Discussion Marathon

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by leehuan View Post
    The probabilistic interpretation: X ~ Bin(n, p) counts the no. of sucesses in n independent Bernoulli trials (with success parameter p) and Y ~ Bin(m, p) counts the no. of successes in m independent Bernoulli trials. So if X and Y are independent, X + Y is counting the no. of successes in m+n independent Bernoulli trials (each with success prob. p), whence X+Y ~ Bin(m+n, p).
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    Re: University Statistics Discussion Marathon

    Another one you can do similarly:


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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by InteGrand View Post
    Another one you can do similarly:



    Factorised the above since I saw a pattern, lel.

    (*) If I didn't do this, the result will be (1 - (1-p)^z)(1 - (1-q)^z) which is too hard to put into the form (1 - r^z).

    Not sure about a probabilistic interpretation though.
    Last edited by He-Mann; 7 Nov 2016 at 2:43 PM.

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    Re: University Statistics Discussion Marathon

    Received this question from a friend so wanted to share it here.

    You roll a conventional die repeatedly. If it shows 1, you must stop, but you may choose to stop at any prior time. Your score is the number shown by the die on the final roll. Consider the strategy: stop the first time that the die shows r or greater.

    a) What stopping strategy (i.e. what value of r) yields the greatest expected score?

    b) What strategy would you use if your score were the square of the final roll?

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    Re: University Statistics Discussion Marathon





    Last edited by InteGrand; 7 Nov 2016 at 4:39 PM.
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post
    Just read up last night that if SSR=SST then its a perfect linear relationship.

    Anyway I am taking a break from this forum for the next 1 month, got alot of work to do, so I'll look forward to bumping into you guys again in July. Just decided that I needed a break as I have been sitting in front of a computer all the time and have no social life as well.
    What is SS(Trial)?

    I understand that a perfect-fit occurs when sum of square residual is zero which means sum of square regression equals sum of square total.

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    Ancient Orator leehuan's Avatar
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    Statistics (thread merged)

    It's a geometric distribution but suppose we didn't know that




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    Re: Statistics

    Quote Originally Posted by leehuan View Post
    It's a geometric distribution but suppose we didn't know that



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    Re: Statistics

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    Re: Statistics

    ELI5 Please
    BCom acct/fins @UNSW

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    Re: Statistics

    Quote Originally Posted by Confound View Post
    ELI5 Please
    Explain what? Every single detail? InteGrand's sum derivation?

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    Re: University Statistics Discussion Marathon

    Which of the following R expressions are logical? (i.e. evaluation of them results in logical objects). Select all that apply.

    - exp(x)
    - y>=32
    - B==’a”
    - 1:50
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