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MathSofiya

  • 3 years ago

Intro to Statistics: \[\mu=\sum xP(x)\] \[\mu\] is the expected value of x So would I add the x values and P(x) values and then multiply them to get \[\mu\]? x: 0 1 2 3 4 5 P(x): 0.237 0.396 0.264 0.088 0.015 0.001

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  1. hartnn
    • 3 years ago
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    multiply corresponding x and p(x) values, like 0*0.237+1*0.396 .......

  2. slaaibak
    • 3 years ago
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    you would multiply 0 by 0.237 add it to 1 times .396 add it to 2 times 0.264 etc... the sum would be u

  3. MathSofiya
    • 3 years ago
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    oh ok. It seemed too simple

  4. MathSofiya
    • 3 years ago
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    Thanks

  5. hartnn
    • 3 years ago
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    welcome ^_^

  6. MathSofiya
    • 3 years ago
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    for the standard deviation I have the equation \[\sigma=\sqrt{\sum(x-\mu)^2P(x)}\] So, here I do: \[0-\mu=-1.253\] \[1-\mu=1-1.253=-.253\] \[2-\mu=2-1.253=.747\] \[3-\mu=3-1.253=1.747\] \[4-\mu=4-1.253=2.747\] \[5-\mu=5-1.253=3.747\] square each solution then multiply to P(x), then add those solutions up

  7. hartnn
    • 3 years ago
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    yes! finally take square root then.

  8. MathSofiya
    • 3 years ago
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    oh yes of course. Thank you!

  9. MathSofiya
    • 3 years ago
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    how do I make a table in latex? I have to submit my work electronically and a table would make it easier.

  10. MathSofiya
    • 3 years ago
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    I couldn't find it here http://en.wikipedia.org/wiki/Help:Displaying_a_formula#Diagrams_in_TeX

  11. hartnn
    • 3 years ago
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    let me search.

  12. hartnn
    • 3 years ago
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    http://en.wikibooks.org/wiki/LaTeX/Mathematics

  13. hartnn
    • 3 years ago
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    maybe write in matrix form .....of nX2 i'll look up something specifically for table

  14. MathSofiya
    • 3 years ago
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    oh ok, thanks

  15. hartnn
    • 3 years ago
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    http://openstudy.com/users/accessdenied#/updates/4fa5b375e4b029e9dc35a2cf

  16. MathSofiya
    • 3 years ago
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    \hlines what does that do?

  17. MathSofiya
    • 3 years ago
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    I think I get it. I'll just use \\ \hlines before i move on to the next line. Makes sense

  18. hartnn
    • 3 years ago
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    ok and http://en.wikibooks.org/wiki/LaTeX/Tables

  19. MathSofiya
    • 3 years ago
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    oh perfect! There's the explanations for \hlines. Thanks! =D

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