Franklin D. Roosevelt: Life Before the Presidency. Franklin D. Roosevelt: Life Before the Presidency. Franklin Delano Roosevelt was born to James and Sara Roosevelt in 1882. James was a land-owner and businessmen of considerable, but not awesome, wealth from New York.
How to Measure Variability in Statistics. Statisticians use summary measures to describe the amount of variability or spread in a set of data. The most common measures of variability are the range, the interquartile range (IQR), variance, and standard deviation.
variable-a quantity that can assume any of a set of values. variable quantity. quantity-the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable. argument-a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable.