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.
Moderating Variable â A moderating variable, or moderator, is a variable that heightens or diminishes the relationship between the independent and dependent variables. For example, the relationship between mentoring and outcomes may vary, depending on the gender of the mentee. In this case, gender is a moderator.