Formulas

Question 1

What is the formula for the weighted mean?

Answer 1

E(x*w)/E(w)

Question 2

What is the formula for the Absolute Deviation Mean?

Answer 2

E|x-xbar|/n

Question 3

What is the formula for the variance of the sample?

Answer 3

E(x-xbar)^2/n-1

Question 4

What is the formula for the variance of a population?

Answer 4

E(x-xbar)^2/N

Question 5

What is the formula for the Coefficient of Variance for a sample?

Answer 5

(s/xbar)*100

Question 6

What is the formula for the Coefficient of Variance for the population?

Answer 6

(sigma/mu)*100

Question 7

What is the formula for the sample covariance?

Answer 7

E(x-xbar)(y-ybar)/(n-1)

Question 8

What is the formula covariance of a population?

Answer 8

E(x-mu-of-x)(y-mu-of-y)/N

Question 9

What is the formula for the sample correlation coefficient?

Answer 9

covariance/(s-sub-x*s-sub-y)

Question 10

What is the formula for the population correlation coefficient?

Answer 10

covariance/(sigma-sub-x*sigma-sub-y)

Question 11

How do we find the error?

Answer 11

Actual result - Estimated result