a relationship between two variables that tend to move in the same direction
a relationship between two variables that move in opposite direction
when there is no pattern that can be detected between the variables
where every member of a poulation has an equal chance of being selected for a sample
a non-probability sampling method that relies on the non-random selection of a predetermined number or proportion of units
a random sampling method where the population is divided into natural groupings of people
a distribution where the longer "tail" extends to the right side of the peak
a distribution where the long "tail" extends to the left side of the peak