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Thread: Statistics Marathon & Questions

  1. #26
    Exalted Member BlueGas's Avatar
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    Re: University Statistics Discussion Marathon

    The p-value is actually wrong, what degrees of freedom did you use?

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    Re: University Statistics Discussion Marathon

    My bad I forgot the degrees of Freedom. For this question it should be 7 degrees of freedom. (My previous working I used a value of 8)



    Here is my cell working to get the P-Value on Excel. The P-Value should be 0.052 to 3 decimal places.
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    Exalted Member BlueGas's Avatar
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    Re: University Statistics Discussion Marathon

    Am I correct for this?




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    Re: University Statistics Discussion Marathon





























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    Exalted Member BlueGas's Avatar
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    Re: University Statistics Discussion Marathon

    I'm getting 1.82215E-38 when using the command =CHIDIST(210.9,12), how did you get 0?

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    Re: University Statistics Discussion Marathon

    yeah i rounded my answer to 0.000 , I also got that value of 1.822 E -38
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post
    yeah i rounded my answer to 0.000 , I also got that value of 1.822 E -38
    So there's no evidence of a relationship?

  8. #33
    Rambling Spirit
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    Re: University Statistics Discussion Marathon

    Note that for most practical purposes, something on the order of 10-38 like the Excel calculation there is as good as 0 (since 10-38 = 0.0000…01, where the 1 comes in the 38th decimal place, so there's thirty-seven 0's after the decimal point).

    The E in the Excel thing just means "times 10 to the power of".
    Last edited by InteGrand; 28 May 2016 at 2:03 PM.
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  9. #34
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post
    This is confusing me, if we reject the null hypothesis, shouldn't that mean there is a relationship? Because the null hypothesis assumes there's is no relationship...

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    Re: University Statistics Discussion Marathon

    It seems that the word 'independent' confused me lol.

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    Re: University Statistics Discussion Marathon









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    Exalted Member BlueGas's Avatar
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post








    How come the null and alternative tests are different in this case? Is it because there are no categorical variables? This is confusing knowing whether there will be a relationship or not depending on the type of variables, do you know what I mean?


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    Re: University Statistics Discussion Marathon







    Last edited by davidgoes4wce; 28 May 2016 at 2:42 PM.
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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post






    Yeah that's the easy part but what's the interpretation of the p value? That's the part which I need to understand. The two figures I posted (the one you helped me in and the second one now) have different null and alternative hypothesis tests.

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by BlueGas View Post
    How come the null and alternative tests are different in this case? Is it because there are no categorical variables? This is confusing knowing whether there will be a relationship or not depending on the type of variables, do you know what I mean?

    I think if you read up a bit more on the 'Chi Squared of the Contingency table' it will be better for you. [/tex]










    Last edited by davidgoes4wce; 28 May 2016 at 3:16 PM.
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    Re: University Statistics Discussion Marathon

    Speaking of Statistics have any of you guys used R Programming and Statistical software? (for say work or university purposes)?


    I want to be more proficient at this software and I enjoy using it in comparison to Excel, SPSS or Minitab for that matter as the speed is alot quicker.
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    University Statistics Discussion Marathon

    Quote Originally Posted by BlueGas View Post
    Yeah that's the easy part but what's the interpretation of the p value? That's the part which I need to understand. The two figures I posted (the one you helped me in and the second one now) have different null and alternative hypothesis tests.
    The p-value is the probability of an observation occurring assuming the null hypothesis is actually true. If the p-value is very low then the observation you see is very unlikely if the null hypothesis is true. If you believe the observation you see is typical (has a higher probability of occurring) then it is likely that your assumption may not be right, hence the decision reject it.

    Quote Originally Posted by davidgoes4wce View Post
    Speaking of Statistics have any of you guys used R Programming and Statistical software? (for say work or university purposes)?


    I want to be more proficient at this software and I enjoy using it in comparison to Excel, SPSS or Minitab for that matter as the speed is alot quicker.
    I've used R once upon a time

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by Trebla View Post
    The p-value is the probability of an observation occurring assuming the null hypothesis is actually true. If the p-value is very low then the observation you see is very unlikely if the null hypothesis is true. If you believe the observation you see is typical (has a higher probability of occurring) then it is likely that your assumption may not be right, hence the decision reject it.


    I've used R once upon a time
    There seems to be alot of jobs out there for people who are skilled up in R and SPSS. It pays to focus on one or two specific areas.
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    Re: University Statistics Discussion Marathon

    Topic of this question is Sum and Difference of independent normal variates



    Is there a mistake in this question? I get the feeling that they have substituted the wrong value of 40 in , which should have been 20.


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    Re: University Statistics Discussion Marathon




















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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post

































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    Re: University Statistics Discussion Marathon



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    Re: University Statistics Discussion Marathon

    I'll admit I got this question from a quiz and from my understanding reading a textbook (which shows Excel cell calculation) my interpretation of this calculation is it should be :

    = T.DIST.RT((25.23-19)/14.03, 24)




    Last edited by davidgoes4wce; 31 May 2016 at 7:39 AM.
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    Re: University Statistics Discussion Marathon

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    Re: University Statistics Discussion Marathon

    Quote Originally Posted by davidgoes4wce View Post
    I'm guessing that the p value would change but I don't know lol, would like to know the answer though.
    davidgoes4wce likes this.

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