anonymous
  • anonymous
1234 Points: 2Question 2 Ten employees of a nursing home, having been given a course in cardiopulmonary resuscitation (CPR), scored 17, 20, 12, 14, 18, 23, 17, 19, 18, and 15 on a test administered after the completion of the course. Find the standard deviation and variance. Standard deviation = 2.97; Variance = 8.81 Standard deviation = 8.81; Variance = 8.81 Standard deviation = 8.81; Variance = 2.97 Standard deviation = 3.13; Variance = 9.59
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
@ZoMbAsH
anonymous
  • anonymous
@welshfella @TheSmartOne
welshfella
  • welshfella
hmm see if i remember this First find the mean of all the values by adding up all the values then dividing by 10

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anonymous
  • anonymous
k
anonymous
  • anonymous
17.3
welshfella
  • welshfella
the subtract the mean from each of the values so for 17 this will give 17-17.3 = -0.7 do this for all 10 values
anonymous
  • anonymous
I'll be honest I have no idea :(
anonymous
  • anonymous
why u choose 17?
welshfella
  • welshfella
just as an example
anonymous
  • anonymous
oh i see
welshfella
  • welshfella
then you square each of the results and add them up. Finally divide the total by n
welshfella
  • welshfella
|dw:1435251903888:dw|
anonymous
  • anonymous
i dont no what the or the upside down h is
welshfella
  • welshfella
where mu is the mean and Sigma means the total sum
welshfella
  • welshfella
the n is total number of readinsg = 10
welshfella
  • welshfella
thats the variance the standard deviation is the square root of the variabce
welshfella
  • welshfella
* variance
triciaal
  • triciaal
be careful with your computation
welshfella
  • welshfella
I'm relying in memory but i think this is right
welshfella
  • welshfella
maybe triciaal will confirm?
anonymous
  • anonymous
so far i got -0.3, 2.7, -5.3, -3.3, 0.7, 5.7,-0.3, 1.7, 0.7, -2.3
welshfella
  • welshfella
Ok so you square each one of these
welshfella
  • welshfella
0.09, 7.29 etc
anonymous
  • anonymous
ok
welshfella
  • welshfella
now add them up then divide by 10
anonymous
  • anonymous
0.09, 7.29, 28.09, 10.89, 0.49, 32.49, 0.09, 2.89, 0.49, 5, 29
welshfella
  • welshfella
look s good
triciaal
  • triciaal
@welshfella your process is fine, formula is correct, great job I was referring to the simple stuff 17 - 17.3 not = -0.7
anonymous
  • anonymous
i got 9,807? wait did i do that wrong
triciaal
  • triciaal
@jordanawest22 did you actually find the mean?
anonymous
  • anonymous
i subtracted everythin from 17.3...ex)17-17.3....then i added them and divided by 10 and got , 8.807
triciaal
  • triciaal
no after you subtract you square each then add before dividing by N
anonymous
  • anonymous
what?, but the answer is up there??????
welshfella
  • welshfella
i'm getting a bit confused myself!!!!! its value - mean right?
anonymous
  • anonymous
thats what i did
triciaal
  • triciaal
|dw:1435256442515:dw|
welshfella
  • welshfella
so the first 1 is 17-17.3 = -0.3
triciaal
  • triciaal
for the X each entry in the data here I have 1,2,3,4,5,
anonymous
  • anonymous
i found the mean of the numberss in the question then i subtrated the mean by all of the units in the problem, i got mostly decimals...then i squared them all then added them then divided by 10
welshfella
  • welshfella
yes thats correct - - i think its best to put it in a table as triciall has then you are less likely to make errors
anonymous
  • anonymous
ok, i got 8.81 so that would be the variance right?
welshfella
  • welshfella
i got 8.81 for the variance
welshfella
  • welshfella
yes
anonymous
  • anonymous
and to find the variance i do what now?
welshfella
  • welshfella
8.81 is the variance std dev = square root of the variance
triciaal
  • triciaal
|dw:1435256789840:dw|
welshfella
  • welshfella
sqrt 8.81 = ?

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