1. Section 2.5 notes Measures of Variation
Statistics
Section 2.5 notes
Measures of Variation

2. The range of a set of data is the difference between the highest value and the lowest value.
Range = highest - lowest

3. The standard deviation of a set of values is a measure of how much the individual values vary from the mean.
Abbreviation for sample standard deviation is s.

4. A smaller standard deviation indicates that the values in the data set are close to the mean. Larger std dev indicates more variation in the data.

5. Variance – standard deviation squared – not very common measure of variation.

6. Round-off Rule
Carry one more decimal place than is present in the original set of data.