Statistics to describe a data set Flashcards
What do measures of central tendency represent?
they represent the “middle” of the data set and provide a quick summary by identifying the central position of values within the data set.
the most common measures of central tendency include mean, median and mode.
What is the median?
the middle value once all values have been organized by magnitude
What is the mode?
the value that occurs most often
What are measures of dispersion?
describe how closely clumped together or widely spread apart the values are within a data set
What is interquartile range?
calculated by subtracting the value of the first quartile from that of the third quartile. provides a summary of the amount of dispersion percent in the middle half of the data. trimming the upper 25% and lower 25% of the data from analysis eliminates the influence of any outliers.
What is standard deviation?
measure of the dispersion of values in a data set and is expressed in the same units as the value themselves.
