Probability and Statistics Flashcards
1
Q
probability
A
the measure of how likely a particular event or outcome is to occur
2
Q
statistics
A
the analysis and interpretation of numerical data
3
Q
factorial n!
A
- product of all positive integers from 1 to n
- for example
6 ! = 6 x5x4 x3 x2x1= 720
-equal to the number of ways of arranging n distinct objects in a sequence
4
Q
permutation
A
- an order-conscious subset of elements taken from a set
- order is significant –abc and bca are different permutations
For example if a set contains a,b,c and d, 24 permutation of three elements are possible: abc, abd, acb, acd, adb, adc, bac, bad, bca, bcd, bda, bdc, cab, cad, cba, cbd, cda, cdb, dab, dac, dba, dbc, dca, dcb
5
Q
combination
A
- a subset of elements taken from a set
- order is not significant– abc and bca are the same combination
For example, if a set constains a,b,c and d four combinations of three elements are possible: abc, abd, acd, and bcd
The combination abc could also be written as acb, bac, bca, cab, or cba. All six represent the same combination
6
Q
set
A
a collection of elements
7
Q
elements
A
a single item or outcome
8
Q
outcome
A
a possible result of an experiment or trial
9
Q
event
A
A set of outcomes that satisfy a particular condition
10
Q
sample space, S
A
- the set containing all possible items or outcomes in the situation being studied
- also called universe, U
11
Q
independent events
A
- if the success or failure of event A has no affect on the probability of even B, then the two events are independent
For example, a die is rolled twice: - Event A is rolling a six on the first roll of a die
- Event B is rolling a six on the second roll
Events A & B are independent
12
Q
dependent events
A
- If the success or failure of events A affects the probability of event B, then the two events are dependent
13
Q
mode
A
the value that occurs most frequently in the sample set
14
Q
median
A
the point in the sample set at which there are equal numbers of samples above and below
15
Q
mean
A
the sum of all samples in the set divided by the numbers of samples