Sampling
A group we want to find information about. It could be a group of people or simply a group of numbers.
A population
The chance of something happening.
Probability
When information about every member of the population is collected. The disadvantage of this method is that if the population is large, it can be difficult to collect and process so much information.
A census
The range of values of a random variable
Sample space
When each member of the sample frame has an equal chance of being selected.
Random sampling
The number of ways that the event can occur, divided by the total number of outcomes.
Theoretical probability
When information is collected from a small representation of the population. For example, if we were trying to find out what Britain"s favorite TV show is, it would be impractical to ask everybody in the country (as a census would do). Instead, 1000 people might be chosen and asked.
Sample Survey
An event that includes 2 or more independent events
The collection of all of the sampling units. Ideally, this should cover the whole population.
Sampling frame
Finding the probability of an event by using experiments of collecting data
Finding the probability of an event by using experiments of collecting data