anonymous
  • anonymous
second part @jim_thompson5910
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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jim_thompson5910
  • jim_thompson5910
for the first column, under the \(\large x_i - \bar{x}\), you will subtract the mean from each score (score minus mean)
anonymous
  • anonymous
so it will be 90-90,90-90,90-80,90-100,etc @jim_thompson5910

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jim_thompson5910
  • jim_thompson5910
yes and the results will all go in that column
anonymous
  • anonymous
are u sure its not the mean -score @jim_thompson5910
anonymous
  • anonymous
hello
jim_thompson5910
  • jim_thompson5910
it's score - mean
jim_thompson5910
  • jim_thompson5910
that's what the xi - xbar means xi is the score
jim_thompson5910
  • jim_thompson5910
|dw:1433566821653:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1433566832765:dw|
anonymous
  • anonymous
so some will be negative @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
|dw:1433566847436:dw|
jim_thompson5910
  • jim_thompson5910
yes it's normal to have negative differences
anonymous
  • anonymous
so how I find the total? @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
you add up all of the numbers in the column to get the total
jim_thompson5910
  • jim_thompson5910
you'll have 3 totals (one per column)
anonymous
  • anonymous
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
jim_thompson5910
  • jim_thompson5910
now take the absolute value of each result that will form the next column over
jim_thompson5910
  • jim_thompson5910
|0| = 0 |0| = 0 |-10| = 10 etc etc
anonymous
  • anonymous
so will |10| be -10 or just stay 10 @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
anything positive will stay the same
jim_thompson5910
  • jim_thompson5910
absolute value measures distance that number is from 0
jim_thompson5910
  • jim_thompson5910
distance is never negative
anonymous
  • anonymous
add em all up for the total again @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
yes
anonymous
  • anonymous
how to find the variance @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
square everything in column 1 to get column 3
jim_thompson5910
  • jim_thompson5910
0^2 = 0 0^2 = 0 (-10)^2 = 100 10^2 = 100 etc etc
jim_thompson5910
  • jim_thompson5910
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
anonymous
  • anonymous
did u get 490 for the total of the variance @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
divide 490 by 8 to get the variance
jim_thompson5910
  • jim_thompson5910
anonymous
  • anonymous
what do these measures of spread tell you about Bryce grades? @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
I'm not sure what kind of answer they want here
jim_thompson5910
  • jim_thompson5910
But the general rule is that the larger the standard deviation, the more spread out the scores are
anonymous
  • anonymous
so who do you think should still win after all the work we have done... I still say Bryce @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
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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