# The Practice of Statistics: Chapter 6: Probability and Simulation

## 18 terms

### simulation

the imitation of change behavior, based on a model that accurately reflect the phenomenon under consideration

### independent

when the results of one variable don't affect another

### randInt(min,max,num)

randomly selects num integers from min to max

### random

when individual outcomes are uncertain but there is a regular distribution of outcomes in a large number of repetitions

### probability

the long-term relative frequency

### sample space (S)

the set of all possible outcomes

### event

and outcome of a random phenomenon, a subset of the sample space

### probability model

a mathematical description of a random phenomenon consisting of a sample space and a way of assigning probabilities to events

### tree diagram

enumerates each outcome in the sample space

### Multiplication Principle

If you can do one task in n1 ways and a second task in n2 ways, then both tasks can be done in n1*n2 ways

### sampling with replacement

when the second draw is exactly like the first

### sampling without replacement

when you don't replace the things you select

### disjoint

have no outcomes in common and cannot occur simultaneously

### complement

the probability that something doesn't happen

### union

the or of two sets

### joint event

the simultaneous occurence of two events

### conditional probability

the probability of one event given another

### intersection

the and of some events