2006-06-06 12:21:53 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
it's a Greek letter. You can assign it with any meanings. The capital sigma is most commonly associated with summation, series, infinite series. The small sigma is often used in statistics to denote standard deviation(Big sigma is often used to mean dhe covariance matrix too).. but these associations are weaker as u can use any letter or symbol to denote them. Small sigma is also used to mean the sigma field in probability theory.
2006-06-06 12:33:19 · answer #1 · answered by Anonymous · 1⤊ 0⤋
In statistical process control it refers to "standard deviation." However, SPC users with indepth SPC knowledge know that sigma and standard deviation are not exactly the same. To determine true sigma, users must also use a constant table, which has numbers based on subgroup sampling quantity. Standard deviation uses the same formula, but without the subgroup sampling quantity constant value.
From ASK.COM:
Sigma is used in statistics to mean "standard deviation". This is a measure of the spread or variation in a collection of numbers. For example if the 30 students in your class write a test and everyone gets between 70 and 80 then the standard deviation of the 30 scores would be quite small. If, however, the 30 scores range form the 40's to the 90's then the standard deviation would be larger.
2006-06-06 12:36:48 · answer #2 · answered by otbpoc 3 · 0⤊ 0⤋
The Sigma notation means Summation. Its mean the sum of all the numbers.
2006-06-06 12:24:15 · answer #3 · answered by buklao 3 · 0⤊ 0⤋
it means "sum of." It's called summation notation. The number at the bottom indicates the SUMMATION VARIABLE (usually x) and what its starting value is (x=1, for instance). The number on top of the sigma is the upper limit of the summation variable. So basically, you're solving the function that follows for the starting value, then adding to it the solution for x+1, then for x+2, all the way to the upper limit, and add the results all together.
2006-06-06 12:29:46 · answer #4 · answered by Firstd1mension 5 · 0⤊ 0⤋
sigma notation is used for addition.
a1+a2+.... = sigma(ai)
from i = 1 to n or infinity
2006-06-06 12:25:37 · answer #5 · answered by h2 2 · 0⤊ 0⤋
THE SUM OF THE DATA. THE SUM!
Like, like... You could set of data e, which is 3, 5 and 11, and you're like Σe = 19
2006-06-06 12:24:49 · answer #6 · answered by JamesWeb 2 · 0⤊ 0⤋
It means you have to perform an addition over a set of elements.
2006-06-06 12:24:31 · answer #7 · answered by kamelåså 7 · 0⤊ 0⤋
It means sum
2006-06-06 13:30:31 · answer #8 · answered by Me 2 · 0⤊ 0⤋
It means sum.
2006-06-06 12:23:48 · answer #9 · answered by MsMath 7 · 0⤊ 0⤋
does any one know what kuso atama
2006-06-06 12:24:37 · answer #10 · answered by mr.2cool 2 · 0⤊ 0⤋