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