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anonymous
 one year ago
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
anonymous
 one year ago
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

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella @TheSmartOne

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2hmm see if i remember this First find the mean of all the values by adding up all the values then dividing by 10

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2the subtract the mean from each of the values so for 17 this will give 1717.3 = 0.7 do this for all 10 values

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'll be honest I have no idea :(

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2then you square each of the results and add them up. Finally divide the total by n

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2dw:1435251903888:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i dont no what the or the upside down h is

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2where mu is the mean and Sigma means the total sum

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2the n is total number of readinsg = 10

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2thats the variance the standard deviation is the square root of the variabce

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0be careful with your computation

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2I'm relying in memory but i think this is right

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2maybe triciaal will confirm?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so far i got 0.3, 2.7, 5.3, 3.3, 0.7, 5.7,0.3, 1.7, 0.7, 2.3

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2Ok so you square each one of these

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2now add them up then divide by 10

anonymous
 one year ago
Best ResponseYou've already chosen the best response.00.09, 7.29, 28.09, 10.89, 0.49, 32.49, 0.09, 2.89, 0.49, 5, 29

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella your process is fine, formula is correct, great job I was referring to the simple stuff 17  17.3 not = 0.7

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i got 9,807? wait did i do that wrong

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0@jordanawest22 did you actually find the mean?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i subtracted everythin from 17.3...ex)1717.3....then i added them and divided by 10 and got , 8.807

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0no after you subtract you square each then add before dividing by N

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what?, but the answer is up there??????

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2i'm getting a bit confused myself!!!!! its value  mean right?

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1435256442515:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2so the first 1 is 1717.3 = 0.3

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0for the X each entry in the data here I have 1,2,3,4,5,

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i 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
 one year ago
Best ResponseYou've already chosen the best response.2yes thats correct   i think its best to put it in a table as triciall has then you are less likely to make errors

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok, i got 8.81 so that would be the variance right?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.2i got 8.81 for the variance

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and to find the variance i do what now?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.28.81 is the variance std dev = square root of the variance

triciaal
 one year ago
Best ResponseYou've already chosen the best response.0dw:1435256789840:dw
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