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.
A measure of variability: Index of Qualitative Variation (IQV) â A measure of variability for nominal variables. - A measure that shows how diverse a particular category of a variable is of a variable is. â¢ For example, when looking at ethnic diversity among states, some states are very diverse with multiple ethnic