Random Sampling Methods
Sample
A set of data taken from a population
A collection of outcomes from an activity
Weighted or biased
A sample space in which one or more outcomes is favored
Observed frequency
Number of observations of a data value in an experiment
Drawing a conclusion about a population
Estimating a population characteristic
Drawing comparative conclusions about two populations
The 3 objectives of making an inference in statistics that UWU together
Population
All the members or objects about which you want information
Sample Space
The collection of all possible outcomes from an activity or experiment
Complement
Consists of all the outcomes in the sample space that are not in an event E.
Theoretical probability
The ratio of the number of favorable outcomes to the total number of possible outcomes in an experiment
1. Mutually exclusive events
2. Nonmutually exclusive events
3. Complementary events
4. Sample spaces
The four things Venn Diagrams can be used to illustrate:
Stratified random sampling
Sampling method in which the population is divided into nonoverlapping groups then members are randomly selected
Braces
The math name of the kissy faces that show a set of outcomes in a sample space
Probability
A description of how likely an event is to occur
Relative frequency
Ratio of the observed frequency of a data value to the total number of observations in a chance process
Box Plot
A graphic display of the 5 point Summary
Systematic random sampling
Sampling method where first member is randomly selected and other members are selected at regular intervals
Experiment
An activity such as flipping a coin or rolling a die cube
Mutually exclusive
Two events that can't happen at the same time
Experimental probability
Probability based on data collected
How to find Mean Absolute deviation
Find the mean of a data set. Subtract each data from that mean. Find the mean of all the differences and you found the M.A.D
Unbiased Sample
also known as Random samples
Outcome
All the possible results of an activity or experiment
Fair
An experiment in which the probability of each outcome is the same UWU
A break looks like a heartbeat symbol
The symbol on an axis means there is a difference in the scale at the start compared to the other intervals
Quartile
Any of the three values that divide the items of a data set into four equal intervals