answersLogoWhite

0


Best Answer

"The mean of a discrete random variable Y is defined as: µY = ΣyiPr(Y = yi) where the yi's are the values that the variable takes on and the sum is taken over all possible values. The mean of a random variable is also known as the expected value and is often written as E(Y); that is, E(Y) = µY."

-Statistics for the Life Sciences, 3rd Ed, by Samuels and Witmer

In other words, E here is just your expected value, with E2 being this value multiplied by itself. We were also given a 2nd formula for this which states that E(Y) = µ = Σy * f(y).

An example: Say we are given that in a sample of smoking men, we know that they smoke 1-4 cigarettes per day, and the percentages of this sample that fill each value, as follows (made up, and not statistically accurate):

1 - 20%

2 - 45%

3 - 25%

4 - 10%

Our mean of Y (E) would be: The value in the left column times the value in the right column (in percentage) + the same for each value, as follows: (1 x .2) + (2 x .45) + (3 x .25) + (4 x .1) = 2.25

Source: My college stats textbook, documented above.

User Avatar

Wiki User

13y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What is E in statistics and the square of E?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What has the author E E Shuker written?

E. E. Shuker has written: 'Introducing statistics' -- subject(s): Statistics


What has the author James E Wert written?

James E. Wert has written: 'Educational statistics' -- subject(s): Education, Statistics 'Educational statistics from a non-computational viewpoint' -- subject(s): Education, Statistics


What has the author S E Hodge written?

S. E. Hodge has written: 'Statistics and probability' -- subject(s): Mathematical statistics, Probabilities


What has the author Larry E Toothaker written?

Larry E. Toothaker has written: 'Introductory statistics for the behavioral sciences' -- subject(s): Statistics


What has the author Constance E D'Arcy written?

Constance E. D'Arcy has written: 'The problem of maternal welfare' -- subject(s): Cases, clinical reports, statistics, Obstetrics, Statistics, Vital, Vital Statistics


What has the author William E Becker written?

William E. Becker has written: 'Statistics for business and economics' -- subject(s): Commercial statistics, Economics, Microsoft Excel (Computer file), Statistical methods, Statistics


What has the author Carl E Landwehr written?

Carl E Landwehr has written: 'An abstract type for statistics collection in SIMULA' -- subject(s): Statistics, Data processing


What has the author A E Sarhan written?

A. E. Sarhan has written: 'Contributions to order statistics'


What has the author J E Wert written?

J. E. Wert has written: 'Educational statistics'


What does the E mean in statistics?

That depends on the context. Among other things, it can be the number e, which is about 2.718.


Is the Chi Square test related to statistics?

Yes. It is a statistical test.


Why do we square root in psychological research?

we use square root in statistics in psychological research for such things as standard deviationsl