The Textbook Mentioned That the Mean of Y,E(Y)is Called the First

question 69

Essay

The textbook mentioned that the mean of Y,E(Y)is called the first moment of Y,and that the expected value of the square of Y,E(Y2)is called the second moment of Y,and so on.These are also referred to as moments about the origin.A related concept is moments about the mean,which are defined as E[(Y -µY)r].What do you call the second moment about the mean? What do you think the third moment,referred to as "skewness," measures? Do you believe that it would be positive or negative for an earnings distribution? What measure of the third moment around the mean do you get for a normal distribution?

---

Definitions:

Meiosis

The process by which a gamete is formed, containing one half of the cell’s chromosomes, producing ova and sperm with 23 single, unpaired chromosomes.

Fertilization

The process of a sperm cell joining with an egg cell to create a new organism.

Mutation

A change in the DNA sequence within a gene or chromosome of an organism leading to variation.

Chromosomes

Structures located in the nucleus of cells, made up of DNA and proteins, that carry genetic information.