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#1 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 10:09:36
oh ok thanksss soooooo much=)can you help me with one last question?It deals with the same problem.
The question is:
A dietitian obtains the amounts of sugar (in centigrams) from 100 centigrams in each of 10 different cereals, including Cheerios, Corn Flakes, Fruit Loops, Trix, and 7 others. Those values are listed below.Is the standard deviation of these values likely to be a good estimate of the standard deviation of the amounts of sugar in each gram of cereal consumed by the population of all Americans who eat cereal?Why or why not?
3,24,30,47,43,7,47,13,44,39
#2 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 10:02:07
But i haven't learned that formula in class=/
#3 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:57:47
so the answer that i got can also be the answer for the sample population?
#4 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:52:34
STUPID ME!!!!!I just realized we need to find the standard deviation for the sample population=(((9
#5 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:40:22
so it's 289.57 and the square root of that is 17.016
#6 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:35:13
i did get 2606.1
#7 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:30:26
i got 286.2666 so i rounded it to 286.27
#8 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:27:40
i got 2576.4/9=286.27
#9 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:24:02
after putting in all the number into the formula i got 286.27.Im just not sure if it's right.=/
#11 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:20:08
we only talked about this formula in class.
#12 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:14:55
how about if it was for the sample population?what would the formula be?
#13 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:12:11
ohhh ok
#14 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:06:09
the whole population
#15 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 09:02:45
oh,i got 86.49.Thanks.Im just having trouble filling in the formula with the right numbers.
#16 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 08:56:03
actually yes i got all those numbers,but i posted the numbers i got after finding the square root of the numbers you posted
#17 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 08:53:52
3-29.7=(-26.7)squared=712.89
24-29.7=32.49
30-29.7=0.09
47-29.7=299.29
43-29.7=176.89
7-29.7=515.29
47-29.7=299.29
13-29.7=278.89
44-29.7=204.49
39-29.7=8.49
and the total for all those numbers is 2528.1
#19 Re: Help Me ! » Help with standard deviation=/ » 2010-02-21 08:36:46
I think so.
Its
square root of (x-mean)squared over n-1.
I subtracted the mean from each number and squared the answers for each,then i added all of the square roots of each number and i dont know what to do next.
#20 Help Me ! » Help with standard deviation=/ » 2010-02-21 08:26:33
- Skromnaya
- Replies: 39
i am a bit confused on how to do the standard deviation of a set of numbers.
For example:
3,24,30,47,43,7,47,13,44,39
how do i find the standard deviation for those numbers?
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