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anonymous

  • one year ago

second part @jim_thompson5910

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  1. anonymous
    • one year ago
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  2. jim_thompson5910
    • one year ago
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    for the first column, under the \(\large x_i - \bar{x}\), you will subtract the mean from each score (score minus mean)

  3. anonymous
    • one year ago
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    so it will be 90-90,90-90,90-80,90-100,etc @jim_thompson5910

  4. jim_thompson5910
    • one year ago
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    yes and the results will all go in that column

  5. anonymous
    • one year ago
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    are u sure its not the mean -score @jim_thompson5910

  6. anonymous
    • one year ago
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    hello

  7. jim_thompson5910
    • one year ago
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    it's score - mean

  8. jim_thompson5910
    • one year ago
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    that's what the xi - xbar means xi is the score

  9. jim_thompson5910
    • one year ago
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    |dw:1433566821653:dw|

  10. jim_thompson5910
    • one year ago
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    |dw:1433566832765:dw|

  11. anonymous
    • one year ago
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    so some will be negative @jim_thompson5910

  12. jim_thompson5910
    • one year ago
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    |dw:1433566847436:dw|

  13. jim_thompson5910
    • one year ago
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    yes it's normal to have negative differences

  14. anonymous
    • one year ago
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    so how I find the total? @jim_thompson5910

  15. jim_thompson5910
    • one year ago
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    you add up all of the numbers in the column to get the total

  16. jim_thompson5910
    • one year ago
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    you'll have 3 totals (one per column)

  17. anonymous
    • one year ago
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    the numbers I got were 0 0 -10 10 9 -9 8 and -8 and the total was 0 @jim_thompson5910 if this is correct I am ready to find the M.A.D

  18. jim_thompson5910
    • one year ago
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    now take the absolute value of each result that will form the next column over

  19. jim_thompson5910
    • one year ago
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    |0| = 0 |0| = 0 |-10| = 10 etc etc

  20. anonymous
    • one year ago
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    so will |10| be -10 or just stay 10 @jim_thompson5910

  21. jim_thompson5910
    • one year ago
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    anything positive will stay the same

  22. jim_thompson5910
    • one year ago
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    absolute value measures distance that number is from 0

  23. jim_thompson5910
    • one year ago
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    distance is never negative

  24. anonymous
    • one year ago
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    add em all up for the total again @jim_thompson5910

  25. jim_thompson5910
    • one year ago
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    yes

  26. anonymous
    • one year ago
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    how to find the variance @jim_thompson5910

  27. jim_thompson5910
    • one year ago
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    square everything in column 1 to get column 3

  28. jim_thompson5910
    • one year ago
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    0^2 = 0 0^2 = 0 (-10)^2 = 100 10^2 = 100 etc etc

  29. jim_thompson5910
    • one year ago
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    to get the MAD value, you add up everything in column 2 then divide by n = 8 to get the variance, you add up everything in column 3 then divide by n = 8 the standard deviation is equal to the square root of the variance

  30. anonymous
    • one year ago
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    did u get 490 for the total of the variance @jim_thompson5910

  31. jim_thompson5910
    • one year ago
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    divide 490 by 8 to get the variance

  32. jim_thompson5910
    • one year ago
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  33. anonymous
    • one year ago
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    what do these measures of spread tell you about Bryce grades? @jim_thompson5910

  34. jim_thompson5910
    • one year ago
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    I'm not sure what kind of answer they want here

  35. jim_thompson5910
    • one year ago
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    But the general rule is that the larger the standard deviation, the more spread out the scores are

  36. anonymous
    • one year ago
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    so who do you think should still win after all the work we have done... I still say Bryce @jim_thompson5910

  37. jim_thompson5910
    • one year ago
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    I'm not sure of that either. The two students both have good grades, but I guess Bryce has a higher max and Q3

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