Measures Flashcards
Mean, median, mode, dispersion, asymmetry, position, relationship.
What is mean?
Average
What is median?
Middle value or midpoint of a set.
What is mode?
The value that occurs most often.
What are measures of dispersion?
The study of SPREAD or DISTRIBUTION of the data in a population.
What is range?
The DIFFERENCE between the LARGEST and the SMALLEST values within a set.
What is variance?
Measures how SPREAD OUT the data points in a set are FROM THEIR MEAN VALUE.
What is standard deviation?
The SQUARE ROOT of the VARIANCE.
What is negative skewness?
When the curve is skewed towards the RIGHT.
What is positive skewness?
When the curve is skewed towards the LEFT.
What is zero skewness?
Normally distributed data (undefined skewness).
What are measures of asymmetry?
Skewness - positive, negative or zero
Name 3 common measures of position.
Percentiles
Quartiles
Standard Scores
What is a Percentile?
Elements in a set divided by 100 equal parts.
What is a Quartile?
Ordered data that is divided into 4 equal parts.
What are measures of relationship?
Used to find SIMILARITIES between DIFFERENT VARIABLES.
