Measures of dispersion

Question 1

Range

Answer 1

The difference between highest to lowest value

Question 2

A03 (Easy To Calculate)

Answer 2

E- Arrange values in order and subtract largest from smallest
E- Simple formula, easier than the standard deviation

Question 3

A03 (Does Not Account For The Distribution Of The Scores)

Answer 3

E- The range does not indicate whether most numbers are closely grouped around the mean or spread out evenly
E- The standard deviation is a much better measure of dispersion in this respect

Question 4

Standard Deviation

Answer 4

Measure of the average spread around the mean. The larger the standard deviation, the more spread out the data is.

Question 5

A03 (More Precise Than The Range)

Answer 5

E- Includes all values within the calculations
E- Therefore more accurate picture of the overall distribution of data set

Question 6

A03 (It May Be Misleading)

Answer 6

E- Can be distorted by extreme values
E- Also, extreme values may not be revealed, unlike with the range