Central Tendencies And Variability Flashcards
Measures of central tendencies
Mean, median, mode
Measures of variability
Range, variance, standard deviation
What are central tendencies
The most tipi all or common score
Describe the central tendency of THE MEAN
Average score
Representative
Bet way of estimating the Unknown
M = EX/N
Pulled in a distribution away from the median and mode towards the tail
Define THE MODE
The most common score
Unimodal distribution
The peak of a histogram/ frequency Polygon
The mode score is always a score present in the data
Define the THE MEDIAN
The middle score when all scores are RANKED
What should you consider when choosing which central tendency to use
How many different values are there?
Few values - mode, other wise mean or median
What is the shape of the distribution
Considerably skewed distribution - use median
In a perfectly symmetrical distribution, the mean media and mode will be the same
What is variability
How spread out the scores are in a distribution
Define RANGE
A measure of variability
The difference between the higher and lowest scores
Define Interquartile range
A mean sure of variability
The median, then the median of each 50% of the data
Box and whisker plots
Define VARIANCE
A measure of variability
Measures how spread out the data is
