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I think no other method is there. If anyone can throw light on this post pleasethephoenix wrote:Which of the following distribution of numbers has the greatest standard deviation?
(A) {-3, 1, 2}
(B) {-2, -1, 1, 2}
(C) {3, 5, 7}
(D) {-1, 2, 3, 4}
(E) {0, 2, 4}
can we solve it without using formulae
Sars u tried well and is telling a very good way of observation. But still I am not able to figure out how did u selected 1st only when we have some groups having 3 numbers and some have 4 numbers.sars72 wrote:i forgot the formula for SD, but was able to locate the answer by simply looking at the answer choices. SD is basically the spread of the values on either side of the mean and, on observation, it's rather obvious the the spread i.e. deviation is greatest for answer choice A
again, this is based on my relatively poor understanding of statistics. Please correct me if my reasoning is flawed.
money1119 That is clearly evident and you can surely observe and differentiate standard deviation if they are far apart and very close.money9111 wrote:i don't think the quantity of numbers influences the SD, if I'm reading into SARS' explanation correctly. you can have 100 numbers that are close together and 2 numbers that are very far apart, and the standard deviation for the 2 numbers would still be greater than that of the 100 numbers.
is this what you meant sars?
One method would be to compare the ranges and no of elements togetherthephoenix wrote:Which of the following distribution of numbers has the greatest standard deviation?
(A) {-3, 1, 2}
(B) {-2, -1, 1, 2}
(C) {3, 5, 7}
(D) {-1, 2, 3, 4}
(E) {0, 2, 4}
can we solve it without using formulae
Yeah that seems to be a good approach ajith..Now I can visualise what sars22 was trying to say. Yeah this could be a way to solve problem , but is that applicable to all the problems.ajith wrote:One method would be to compare the ranges and no of elements togetherthephoenix wrote:Which of the following distribution of numbers has the greatest standard deviation?
(A) {-3, 1, 2}
(B) {-2, -1, 1, 2}
(C) {3, 5, 7}
(D) {-1, 2, 3, 4}
(E) {0, 2, 4}
can we solve it without using formulae
A) range = 5 and n =3
B) range = 4 and n =4
C) range = 4 and n =3
D) range = 5 and n =4
E) range = 4 and n =3
Look at the highest ranges and when there is tie favor the lesser n (not a scientific approach nevertheless works in this problem)
Now I understood the thing. yeah this kind of approach of range can be clearly applied to all the problems, until we get some confusing case and a combination of large numbers.Lattefah84 wrote:I solved this using the formula for SD but it took very long time. So, is this thing with range applicable to all the problems or we have to search for some way that is sure?
Look for range and # of elements in the set.thephoenix wrote:Which of the following distribution of numbers has the greatest standard deviation?
(A) {-3, 1, 2}
(B) {-2, -1, 1, 2}
(C) {3, 5, 7}
(D) {-1, 2, 3, 4}
(E) {0, 2, 4}
can we solve it without using formulae
I'd just like to emphasize that this is not true in general, even if it may give you the correct answer when dealing with very small sets. If you see a DS question like the following:komal wrote: Look for range and # of elements in the set.
A set with higher the range and fewer the number of element has the higher SD. i.e. A
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