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In a normal distribution with mu equals 25 and sigma equals 3m what number corresponds to z equals -3?
z = (x-mu)/sigma So x = sigma*z + mu = 3m*(-3) + 25 = -9m + 25
How do you compute one sigma deviation?
Let x denote the values of the variable in question. Suppose there are n observations. Let Sx = the sum of all the values. then the mean of x, Mx = Sx/n Let Sxx = the sum of all the squares of the values. The Vx (= the variance of x) is Sxx - (Mx)^2 and sigma(x) = sqrt(Vx). Therefore one sigma deviation, relative to the mean, = Mx - sigma(x), Mx + sigma(x).
What is the symbol for population standard deviation?
Sigma
What is plus or minus two sigma?
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 is the formula for standard error of a contrast?
Denote: ai = contrast and ni = sample size for each level Estimate of contrast: sum( ai ybari ) note: sum is written as Sigma Standard Error of contrast: sqrt( sum( sigma2 ai2 / ni ) ) note: sum is written as Sigma, and lowercase sigma is usually estimated with MSE Sums of Squares of contrast: ( sum( ai ybari ) )2 / ( sum( ai2 / ni ) ) note: sum is written as Sigma Usually when one uses estimate divided by SE, the test statistic follows a t-distribution (unless he/she didn't estimate lowercase sigma). When one uses SS(contrast) divided by MSE, the test statistic follows a F-distribution. The formulas are similar because there's a strong relationship between the t-distribution and the F-distribution. Hopes this helps and sorry I don't know how to write math equations here.
How do you use the sigma sign in math?
The capital letter sigma (Ʃ) means sum, so this tells you to add up a set of numbers.
Sigma?
Oh, dude, Sigma is just a Greek letter that looks like a fancy 'E'. It's used in math and science to represent a sum of numbers. So, like, if you see Sigma in a math problem, it's basically saying, "Hey, add up all these numbers, please." It's like the math world's way of saying, "Do the thing with the numbers, thanks."
What does evaluate the power mean in math?
sigma thita alpha bita gama root square
When was Sigma Sigma Rho created?
Sigma Sigma Rho was created in 1998.
What sorority was Carrie Underwood in?
Sigma Sigma Sigma
When was Sigma Mu Sigma created?
Sigma Mu Sigma was created on 1921-03-25.
What is the motto of Kappa Sigma Sigma?
Kappa Sigma Sigma's motto is 'A kappa sig nunquam mendums'.
When was Sigma Pi Sigma created?
Sigma Pi Sigma was created on 1921-12-11.
What is Phi Sigma Sigma's motto?
The motto of Phi Sigma Phi is 'Do unto others as you would'.
What symbol would you use when automatically adding a set of numbers?
The capital sigma. The capital sigma. The capital sigma. The capital sigma.
When was Phi Sigma Sigma created?
Phi Sigma Sigma was created on 1913-11-26.
How do you do sigma notation on a ti 84 plus?
Hit the Math button (Right under ALPHA) and it should already be on the MATH tab. go down to summation ∑( and you're set!
