# Quick Answer: What Does The U And Upside Down U Mean In Statistics?

## What is the U symbol in probability?

Probability and statistics symbols tableSymbolSymbol NameMeaning / definitionzxstandard scorezx = (x-x) / sxX ~distribution of Xdistribution of random variable XN(μ,σ2)normal distributiongaussian distributionU(a,b)uniform distributionequal probability in range a,b37 more rows.

## What is this symbol μ?

The lowercase Greek letter mu (µ) is used to represent the prefix multiplier 0.000001 (10 -6 or one millionth). … In some texts, the symbol µ is an abbreviation of micrometer(s) or micron(s). These two terms both refer to a unit of displacement equal to 0.000001 meter or 0.001 millimeter.

## What do three equal lines mean?

A symbol with three horizontal line segments ( ) resembling the equals sign is used to denote both equality by definition (e.g., means is defined to be equal to ) and congruence (e.g., means 13 divided by 12 leaves a remainder of 1–a fact known to all readers of analog clocks).

## What does the U mean in statistics?

The symbol ‘μ’ represents the population mean. The symbol ‘Σ Xi’ represents the sum of all scores present in the population (say, in this case) X1 X2 X3 and so on. The symbol ‘N’ represents the total number of individuals or cases in the population.

## What does ∩ mean in probability?

The probability that Events A and B both occur is the probability of the intersection of A and B. The probability of the intersection of Events A and B is denoted by P(A ∩ B). If Events A and B are mutually exclusive, P(A ∩ B)

## What does the math symbol mean?

< Less Than and > Greater Than. … This symbol > means greater than, for example 4 > 2. ≤ ≥ These symbols mean ‘less than or equal to’ and ‘greater than or equal to’ and are commonly used in algebra.

## What does a ∩ B represent?

The intersection symbol ∩ The area where two sets intersect is where objects share both categories. In our example diagram, the teal area (where green and purple overlap) represents the intersection of A and B which we notate as A ∩ B.

## What does B mean in probability?

The conditional probability of an event B is the probability that the event will occur given the knowledge that an event A has already occurred.

## What is a ∆ B?

The symmetric difference of two sets A and B is the set (A – B) ∪ (B – A) and is denoted by A △ B. … A △ B is the set of all those elements which belongs either to A or to B but not to both. A △ B is also expressed by (A ∪ B) – (B ∩ A).

## What is Aubuc?

About “Formula for A union B union C” Formula for A union B union C : Here we are going to see the formula for (A U B U C). n(AUBUC)=n(A)+n(B)+n(C)-n(AnB)-n(BnC)-n(CnA)+n(AnBnC)

## What does this mean in probability?

The chance that something will happen. … Sometimes we can measure a probability with a number like “10% chance”, or we can use words such as impossible, unlikely, possible, even chance, likely and certain. Example: “It is unlikely to rain tomorrow”. As a number, probability is from 0 (impossible) to 1 (certain).

## What does the U and upside down U mean in probability?

It means the Intersection of a set. For example, IF you have a set of even numbers and a set of odd numbers, the Union ‘U’ of these two sets would be ALL numbers. But, the Intersection (upside down U) would mean that NONE of the numbers in Evens are in common with any of the Odds in the second set.

## What does ∩ mean in math?

Definition of Intersection of Sets: Intersection of two given sets is the largest set which contains all the elements that are common to both the sets. … The symbol for denoting intersection of sets is ‘∩’.

## What does U mean in Venn diagrams?

The union of two sets is represented by ∪. (Don’t confuse this symbol with the letter “u.”) This is a two-circle Venn diagram. The green circle is A, and the blue circle is B. The complete Venn diagram represents the union of A and B, or A ∪ B.

## What is the OR rule?

Sometimes we want to know the probability of getting one result or another. The OR rule can help us here if the two results are mutually exclusive. Mutually exclusive means that the two outcomes of the same event cannot happen at the same time. = P(A) + P(B) for mutually exclusive events. …

## What is S in statistic?

By convention, specific symbols represent certain sample statistics. For example, x refers to a sample mean. s refers to the standard deviation of a sample.

## What does C mean in stats?

P(AB) means the probability that events A and B occur. You could write it P(A∩B). The superscript c means “complement” and Ac means all outcomes not in A. … The complement of an event is the subset of outcomes in the sample space that are not in the event. A complement is itself an event.

## What does P AUB )’ mean?

P(A∩B) is the probability that events A and B both happen. Basically ∩ means ‘and’. U is the union, so P(A U B) means the probability that either A or B occurs, or both; it’s the probability that at least one of the events happens.

## What does P XY mean?

Joint Probability Mass Function5.1. 1 Joint Probability Mass Function (PMF) The joint probability mass function of two discrete random variables X and Y is defined as PXY(x,y)=P(X=x,Y=y).

## What are the symbols of sets?

SymbolMeaningExample{ }Set: a collection of elements{1, 2, 3, 4}A ∪ BUnion: in A or B (or both)C ∪ D = {1, 2, 3, 4, 5}A ∩ BIntersection: in both A and BC ∩ D = {3, 4}A ⊆ BSubset: every element of A is in B.{3, 4, 5} ⊆ D30 more rows

## What is the triple equal sign mean?

A triple equals sign means equivalent. Equivalent is not the same ask ‘equals’. … 1/2 is equivalent to 2/4 but 1/2 is not equals to 2/4. Thefore, equivalence and equals are not the same just identical.