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.
PRACTICE VARIABILITY. ï® Refers to the variety of movement and. context characteristics the learner. experiences while practicing a skill. ïµ Key predictor according to motor program. theory (Schmidt) of successful future. performance depends on the amount of. variability the learner experiences during.