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FOCA_7.1

Vocabulary for FOCA_7.1

TermDefinition
sampling A selection taken from a larger group (the 'population') so that you can examine it to find out something about the larger group.
bias A systematic (built-in) error which makes all values wrong in a certain direction.
random sampling Random sampling means that members of a 'population' have equal chances of being selected.
graphical data displays Common ways of displaying data graphically include pie charts, bar charts, histograms, and boxplots (also known as a box-and-whiskers plot).
measures of center A measure of central tendency (measure of center) is a value that attempts to describe a set of data by identifying the central position of the data set (as representative of a "typical" value in the set). Familiar measures of central tendency are the mean, median and mode.
measures of spread Measures of spread describe how similar or varied the set of observed values are for a particular variable (data item). Measures of spread include the range, quartiles and the interquartile range, variance and standard deviation.