Sum of the items divided by number of items (average).
Middle of an ordered set of data.
Difference between the greatest and lowest values in a set of data.
Difference between 1st and 3rd quartile, shows spread of the middle 50% of data.
A data set where the response is a numerical value.
A data set where the response is descriptive.
The whole group that is being studied.
A part of the group being studied.
A sample in which each member of the population has an equal chance of being chosen.
A sample that does not truly represent a population.