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In statistics, sigma is a measure of the standard error of a variable. That is a measure of the spread of the variable around its mean value.
Many variables are distributed approximately according to the Gaussian (Normal) distribution. Even when they are not, the means of repeated samples are (Central Limit Theorem). For the Gaussian distribution, 95% of the observations lie within 1.96*sigma from the mean. This is sometimes rounded to two sigma. While for an exact Gaussian distribution 2 sigma would imply 95.45%, for approximate Gaussian, it is still "around" 95%.
Thus, for example, average IQ (whatever it measures, which certainly is not intelligence!) is 100 and sigma = 15. So 95% of the population will have IQs between 100-2*sigma and 100+2*sigma, which is 70 and 130.
By the way, if you think my comment about what IQs measure is sour grapes, I assure you that is nowhere near the truth!
What else can I help you with?
What is one minus two plus three minus four plus five?
3.
What number comes next 1 5 3 7 5 9?
7 (Seven) is the next number in your sequence ! Plus four minus two plus four minus two plus four minus two and so on and so on !
What is a plus and a plus if a plus and a minus is a minus?
A plus + a plus is a plus.
What is negative 6 divided by 3?
2
Does a minus times a minus equal a plus?
Yes it does. A minus is the opposite of something, so the minus of a minus is a plus.
What area within one standard deviation between and mu and minus and sigma and and mu plus and sigma?
The answer will depend on the distribution of the variable.
What is minus two plus minus six?
-8
What is one minus two plus three minus four plus five?
3.
What is Plus and minus are two?
If something plus and minus something else make two then the initial value must be 2.
What is two minus one minus one plus one minus one plus three minus two plus six?
9A:2 - 1 - 1 + 1 - 1 + 3 - 2 + 6 = 7The answer is seven.
What is the answer to three minus three times six plus two?
Three minus three times six plus two is equal to -13.
What is two minus zero minus zero plus zero?
It Equals 2
What are the two signs of angle?
Plus and minus.
What number comes next 1 5 3 7 5 9?
7 (Seven) is the next number in your sequence ! Plus four minus two plus four minus two plus four minus two and so on and so on !
Compute the population mean margin of error for a 99 percent confidence interval when sigma is 4 and the sample size is 36?
The mean plus or minus 2.576 (4/sqr.rt. 36)= 1.72 So take your average plus or minus 1.72 to get your confidence interval
What five eights plus two thirds minus one fourth?
Five eights plus two thirds minus one fourth is equal to 1.04
What is nine tenths plus two fifths minus one fourth?
Nine tenths plus two fifths minus one fourth is equal to 1.05
