Population - A collection of individual items or people.
Sampling frame - A list of all individual members of a populaton.
Sampling Unit - One individual member of the population.
Statistic - A quantity calculated from the observations of a sample with no unknown parameter.
Sampling Distribution - A distribution of all possible values of a statistic and the probability of obtaining it.
Sample Survey -
- Cheaper than a census
- Advantageous when testing items results in their destruction eg. testing the lifetime of a light bulb
- Data is more readily available
- Natural variation generates uncertainty (disadvatage)
- Can be biased, not truly representative of the population (disdavantage)