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Saylilbaby

  • one year ago

help pls

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  1. saylilbaby
    • one year ago
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  2. saylilbaby
    • one year ago
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    @jim_thompson5910 @Compassionate @Kainui

  3. jim_thompson5910
    • one year ago
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    where are you stuck?

  4. saylilbaby
    • one year ago
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    i havent started @jim_thompson5910

  5. jim_thompson5910
    • one year ago
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    so you're not sure what \(\Large \bar{x}\) means ?

  6. saylilbaby
    • one year ago
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    im not sure how to do anything... this is a summer class i havent learned anything from this...this is a class to get a credit @jim_thompson5910

  7. jim_thompson5910
    • one year ago
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    \[\Large \bar{x}\] means xbar, this is the sample mean

  8. jim_thompson5910
    • one year ago
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    you add up all the numbers in the sample and then divide by the number of numbers

  9. jim_thompson5910
    • one year ago
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    so you have to first go through the graph given to you and pull out all of the data values

  10. anonymous
    • one year ago
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    Each one of the dots represents an amount of numbers in the set. So if a 60 had 2 dots on it, you would have 2 60's in the sequence. (60, 60, ... ) so continue doing that for all the numbers

  11. saylilbaby
    • one year ago
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    is number 1 80? @jim_thompson5910

  12. jim_thompson5910
    • one year ago
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    you're asking about the sample mean being 80? or something else?

  13. saylilbaby
    • one year ago
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    im asking is number 1 80 or 191.47619 @jim_thompson5910

  14. jim_thompson5910
    • one year ago
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    the mean isn't either of those values

  15. saylilbaby
    • one year ago
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    well can u help @jim_thompson5910

  16. jim_thompson5910
    • one year ago
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    did you get these values 60,61,63,65,68,68,68,69,69,70,70,72,74,76,76,76,78,79,80,80,80,80,82,82,82,82,84,85,85,86,86,86,87,88,89,90,90,90,90,90,92,92,92,92,95,95,95,98,99,100 ??

  17. jim_thompson5910
    • one year ago
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    there are 50 numbers in that list above (each one pulled from each dot)

  18. saylilbaby
    • one year ago
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    yes

  19. saylilbaby
    • one year ago
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    80.42 @jim_thompson5910

  20. jim_thompson5910
    • one year ago
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    when you added all of the 50 numbers up, what did you get?

  21. saylilbaby
    • one year ago
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    4021 @jim_thompson5910

  22. jim_thompson5910
    • one year ago
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    you made an error, it should be larger than 4021

  23. saylilbaby
    • one year ago
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    4176 and when divided by 50 i got 83.52 @jim_thompson5910

  24. jim_thompson5910
    • one year ago
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    4176 is too high

  25. saylilbaby
    • one year ago
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    thats wat i keep getting @jim_thompson5910

  26. jim_thompson5910
    • one year ago
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    60+61+63+65+68+68+68+69+69+70+70+72+74+76+76+76+78+79+80+80+80+80+82+82+82+82+84+85+85+86+86+86+87+88+89+90+90+90+90+90+92+92+92+92+95+95+95+98+99+100 = 4,086

  27. saylilbaby
    • one year ago
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    so 81.72 @jim_thompson5910

  28. jim_thompson5910
    • one year ago
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    yes that is xbar

  29. saylilbaby
    • one year ago
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    ok wat about number 2 @jim_thompson5910

  30. jim_thompson5910
    • one year ago
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    use something like this https://www.easycalculation.com/statistics/standard-deviation.php

  31. jim_thompson5910
    • one year ago
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    type in all the numbers separated by commas

  32. saylilbaby
    • one year ago
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    ok i did now wat am i looking for in number 2 @jim_thompson5910

  33. jim_thompson5910
    • one year ago
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    do you see where it says Standard deviation 10.47259

  34. saylilbaby
    • one year ago
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    yes @jim_thompson5910

  35. jim_thompson5910
    • one year ago
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    thats the answer to 2

  36. saylilbaby
    • one year ago
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    3 4 and 5 @jim_thompson5910 wat i do

  37. jim_thompson5910
    • one year ago
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    xbar will be used in place of \(\Large \mu\) the standard deviation is \(\Large \sigma\)

  38. jim_thompson5910
    • one year ago
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    what you need to do is compute 81.72 - k*10.47259 for k = 1, k = 2, and k = 3 also compute 81.72 + k*10.47259 for k = 1, k = 2, and k = 3

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