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 for a data distribution is a number that conveys the idea of spread of the values in the data set around the mean.Measures of variability helps to understand the distribution of data set better. Such measures are called the measures of variability or the measures of variation.easures of Variability. A measure of central tendency which represents the centralness of a data set is not sufficient to describe the data distribution completely.